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Meeting called to order at 11:30 A. M., February 23, by the President: Horace Moses, in the Chair. W. D. Brennan moved that the present Secretary continue, and he furnished an assistant. Before the question was put, he suggested that Frank Sandstrom, of the Colorado-New Mexico Coal Operators' Association, would be a satisfactory assistant, and his motion was extended to include the election of Frank Sandstrom as Corresponding Secretary, subject to confirmation after completion of reorganization, with the present Secretary as Executive Secretary, and that a Committee be appointed, one member from each of the four states, to devise and put into execution a permanent financing and operating policy for the Institute. Seconded and carried. The Chairman appointed W. D. Breunan, A. C. Watts, J. B. Marks, P. J. Quealy, with the President of the Institute as Ex-officio member and chairman.

Jan 1, 1927

[Adams, Douglas K General Electric Co., P.O. Box 2331, Denver 1, Colo. Adams, Kenneth L Peabody Coal Co., 301 N. Memorial Dr., St. Louis, Mo. 63102 Ahlborg, William Joy Mfg. Co., 1400 17th St., Denver, Colo. Allen, Dr. Harry C U. S. Bureau of Mines, Washington, D. C. 20242 Anderson, Robert Mine Safety Appliances Co., 1881 West N. Temple, Salt Lake City, Utah Archer, Bryan J., Jr Peabody Coal Co., 421 Glenwood St., Grand Junction, Colo. Arentzen, E. M W. RD 1, Charleroi, Pa. Arentzen, L. E. Lee-Norse Co., 6030 55th Pl., Arvada, Colo. Arentzen, Rolf F Lee-Norse Co., Box 582, Charleroi, Pa. Arnston, E. K Standard Oil Div. American Oil, Rt. 1, Box 504, Golden, Colo. Artis, Cliff E Big Horn Coal Co., 247 Sherman Ave., Sheridan, Wyo. Atchison, Lee Atchison Construction Co., Drawer D, Aztec, N. Mex. Audin, Clement, Jr Champion Coal Mining Co., Paonia, Colo.]

Jan 1, 1969

PRESIDENT LITTLEJOHN: I have every reason to know Mr. Pryde was carrying out some experiment a while ago in some of his mines. He and I had a little correspondence on the question, and I think he may have a word or two to say about it. He has not been on his feet today at all. I will ask Mr. Pryde to tell us what he has to say. MR. PRYDE: I have not very much to say about shooting coal with permissible powder as far as slack is concerned because we are not in the commercial business. All of our coal goes to the railroad and a very large part of it is crushed for use in the stokers of the locomotives. We are on a 100 per cent permissible powder basis and as far as I am able to see, I do not believe that the percentage of slack is increasing with its use. We find it hard to convince our commercial neighbors of this fact because they are naturally very much against increasing their percentage of slack on ac- count of the low price received for this grade of coal. I, personally, believe that where a change is made from black powder to permissible powder the percentage of slack will be increased for a time because the miners have been accustomed to using black powder and they are rather suspicious about going to the permissible powder and I do not believe that we can blame them very much. So the tendency with them is to use too much powder. We have gradually overcome this, although, as I said before, we have not kept close track of the production of slack. However, we try to get as large an amount of lump coal as possible. Broadly speaking, I can say from observation that in my opinion there is very little difference in the percentage of slack with the use of the permissible powder that we have today than there was with the use of black powder. I also get this information from our mine superintendents. Mr. Peterson and the other explosive men have been very helpful to us in the use of permissible powder and I confess I have to take everything back that I said several years ago. At that time I was against permissible powder, particularly on account of the cost, but, with the newer permissible powder, we have gotten the cost down very well. I know today that the cost of permissible powder in the coal mines of the Union Pacific Coal Company is less than when we were using black powder. I know this because of the fact that we kept a record of the number of tons we got with black powder, and the number of tons we get with permissible powder compares very favorably in cost. I know this, too, because of the fact that our employes, except in the first few weeks of using permissible powder, have made no demand upon us for any in- crease ill pay to offset any added cost that might accrue in the use of permissible powder and the fact that they have asked for no increase is very conclusive proof to me that it is not

Jan 1, 1925

By Jeff Mattern

Topics of Discussion ?Navajo Mine General Information ?Mapping, Photogrammetryand Image Fans ?Planning: Equipment, Control Points, Targets ?Digital Photography ?Software Manipulations: Image Matching, Creating a 3d Image and Triangulation, ?Mapping? Geologic Structure, Data Analysis ?Conclusions ?Other Applications

Jan 1, 2005

By D. C. McClure

MR. McCLURE: Mr. Chairman, you sprang a surprise on me; I really came over here for a good time. Gentlemen, I am not at all qualified to pose as an expert on pulverized fuel; I have merely been making some rather interesting observations, and unfortunately at the present time, a great deal of substantial data, the technical data, I don't happen to have with me; it is still in the process of being calculated, but I will be very glad to tell you some of the observations as I have made them, and in as truthful and complete a way as I can. The question of how we would handle fuel became a very pressing subject in this new Valmont electric plant, which is now under progress. We have studied the methods of burning fuel for a number of years on different types of stokers at the existing plants in Denver; we are burning it with a natural draft chain grate and with underfeed and with forced draft chain grates, and I am very frank to confess at the present time that I have no answer as far as stokers are concerned for a better solution of the problem of burning lignite. In other words, I could not tell you that this or that is a better type of stoker to use for that coal. However, to boil the thing down, after considerable trials, the underfed stoker was chosen as the one most adaptable for the utilizing of lignite fuel if stokers are to be used. In other words, the chain grate was put aside. I might say in support of the chain grate, the prime reason for which that type of stoker was condemned, as far as lignite goes, is the initial investment charge and the large maintenance which is involved.

Jan 1, 1923

Chairman: Mr. R. C. Heers, Project Manager, Kaiser Company, Inc. CHAIRMAN HEERS: Fellows, I can't say it gives me a lot of pleasure to call this meeting together because I would rather somebody else had the job. I haven't anything to say this morning and I think the sooner we get started with the fellows that have something to say, the better pleased everybody will be. The first speaker this morning is Mr. John Griffen of the McNally Pittsburgh Company. He has a talk on coal preparation and I am pleased to present Mr. Griffen.

Jan 1, 1947

The Fourth Session of the Forty-Sixth Meeting of the Rocky Mountain Coal Mining Institute convened at the Hotel Colorado, Glenwood Springs, Colorado, June 21, 1950, at 9:30 a. m., G., E. Sorenson, President, presiding. PRESIDENT SORENSON: The meeting will conic to order, please. Gentlemen, we have quite a program this morning, so we had better push this thing along. Be fore we start this morning, I would like to ask Mr. Davis if he wouldn't come up and say a word or two for us. He is the editor of Coal Age. Mr. Davis. MR. DAVIS: This is quite an unexpected honor. I didn't know that I would be called on to speak to you. It will be brief, but very sincere. I have enjoyed every minute of my stay here with you people in the west. It is my first visit out this way, and I have enjoyed every minute of it. I have two more weeks to go out here, and I will probably see a lot of you in your own back yards.

Jan 1, 1950

By H. Petersen

If a coal mine producing two hundred thousand (200,000) tons of coal per year could effect a 2 per cent decrease in the percentage of slack there would be an additional 4,000 tons of prepared coal produced. Most operators will say that these prepared sizes of coal are worth about $3.00 more per ton to them than the slack or in other words an additional $12,000.00 pier year profit could be made by a decrease of 2 per cent in slack. A large tipple with all the finest modern equipment of shaker screens, conveyors, box car loaders, etc., can only produce a grade of coal dependent upon the coal delivered by the mine car at the top of the tipple. In the mine, coal-cutting machines have been doing their part for many years toward decreasing the percentage of slack. There is therefore, only one phase of production left where real effective work can be done, that is, intelligent and constant supervision of preparatory work and shooting. The quality of coal is really entirely dependent upon the kind of coal produced at the face in the mine. Our problem is therefore, at that place. The writer is thoroughly convinced that with the proper placing of holes the use of correct amount of a suitable explosive, thoroughly tamped, with the bug dust entirely removed from the mining, a decrease in slack can be effected. We will take up this problem under five headings. First-The proper placing of bore holes. Second-The proper amount of permissible powder. Third-The proper loading and stemming of the shot.-Cushing shooting. Fourth-The necessity of removing the bug dust from the mining. Fifth - The - standardization of rounds. First-The Proper Placing of Bore Holes. The most important thing and the real secret of successful blasting of coal is the proper placing of the bore hole. This results in the correct balancing of the shot and the securing of the maximum efficiency of the explo¬sive. If you are operating a mine with a 6-foot coal seam, you most likely are using a 6-foot cutter bar on the coal cutting machines. You should use three holes to properly bring down the coal. (1) A center shot in the middle of the room drilled flat, or rather parallel to the mining-the heights of this hole will depend upon the top parting. If the coal is frozen to the roof, it will be necessary to have the hole as close to the roof as possible. If there is a free parting, the hole may be placed lower but not over twelve inches from the roof. (2)

Jan 1, 1925

Meeting called to order by President Herres, eleven o'clock A. M., Monday, August 27, 1928. Address of Welcome by Mr. T. S. Taliaferro, Jr. Address by Mr. William Redshaw, Chairman of the Rock Springs Chapter of the Institute. Paper, "The Effect of Mechanical Coal Mining on Mine Safety," by Lyman Fearn, State Mine Inspector, Wyoming. Paper, "Safety," F. C. Miller, Chief Chemist, Colorado Fuel & Iron Com¬pany, Trinidad, Colorado. Afternoon session, meeting called to order two P. M. On suggestion of Mr. William Littlejohn, the President appointed a special resolutions committee, consisting of Messrs. P. J. Quealy, R. L. Hair and William Littlejohn, to draft resolutions protesting against the granting of a franchise for piping natural gas into Salt Lake City, to be sent to the City Commissioners of Salt Lake City, with carbon copy to the Utilities Commission of Utah. The Committee submitted resolutions which, upon motion of Mr. Littlejohn, and seconded by Mr. Butler, were adopted and sent by telegraph to the Utilities Commission and the City Commissioners.

Jan 1, 1928

I have sketches of the radiators, and on this sketch up in here (indicating) we show the line from the fan-exhaust steam from the fan, and the trip spray at the mouth of the mine, which is usually near the tipple, the set of radiators on each side of the entry, exhaust steam exhausting in by the radiators, the small atomizers which I mentioned, and the man sprinkling at the hose. There are times, when at different times we have a man sprinkling during the day time, when he is out of the way, and during the night, sprinkling on the motor roads. I will leave that print up here and let you look at it and if you have any questions you wish answered, Mr. McAllister and myself will be glad to answer them. (Applause.) PRESIDENT PRYDE: . I am going to ask Mr. Hair to leave the sketch on the wall. From the back part of the hall, it is hard to see what is there. The figures are very important. I think one member of this association will be glad to know the cost of water, Friend Littlejohn. MR. LITTLEJOHN: I don't know as I want to ask any questions. The only thing I' would say about the cost there, it is very close to that cost that we tabulated for the Utah Fuel Company at the Utah mines here some time ago. We have not tabulated lately. It may be a little over that at the present time if you take the. labor costs and the material. costs. As I remember, some time ago we did get up some figures and it was, as near as I can remember, exactly two cents per, ton for the labor and material. We haven't got the radiators, etc., that the C. F. & I. have in their mines there, probably due to the fact that we have no shortage of water. We have plenty of that there, and our system is absolutely nothing more nor less than pipe lines, hose and nozzles and the man at the end of the nozzle. PRESIDENT PRYDE: I would like to ask Mr. Hair about the cost of the steam. MR. HAIR: That steam we use there in exhausting, of course, is from the fan, and we have a back pressure valve set right here (indicating), from three to four and sometimes five pounds, and the exhaust from the fan was a five or six inch exhaust, and our exhaust into the mine is nothing less than eight inches, and is practically low back pressure you might say, and all those large radiators, that I spoke of, are heated by live steam, and these probably take a little more coal, but as to just what that cost is I couldn't say. As far as the exhaust steam is concerned, you might as well use it in the mine as discharge it outside. MR. HARRINGTON: Mr. Hair, I would like to ask, is this installation on an intake haulage-main haulage course? MR. HAIR: Yes, sir. MR. HARRINGTON: In the winter time, when it is, say between five or ten degrees below zero, how far into that haulage road does the fogging go? MR. HAIR: Well, that goes in half a mile, sometimes in 3,000 feet. MR. HARRINGTON: Wouldn't that interfere pretty seriously with the motor? MR. HAIR: To some extent, but I wouldn't say seriously enough to interefere with the production of coal. We have one mine we are working in two and three-quarters miles. Our mines are all pretty deep, and we don't find it objectionable. I don't believe that it interferes in the production of coal. I don't believe it makes any more difference between a real cold day in winter time than it does in the summer time. MR. HARRINGTON: I was down at Dawson, and in their mines they have an installation very much like Mr. Hair describes, but we went in there one night and stayed all night, getting a certain amount of data, and the fog was intense for-a full half mile; so intense that you could hardly see your hand in front of your face-see your hand that far (indicating) dis-

Jan 1, 1924

PRESIDENT WHITESIDE: I am sure we are very grateful indeed for this very interesting talk that Mr. McClure has given us. If anyone has any questions to ask Mr. McClure I am sure he will be glad to answer them at this time. MR. WEITZEL: I want to ask Mr. McClure whether in the instance he described by-passing the drier, whether there was any rest period between the crusher and the furnace, whether the powdered coal that was not dry was allowed to rest in the pipe or was blown directly into combustion chambers. MR. McCLURE: Yes, it moved directly; there might have been some difference had we given it an opportunity to rest. We just had to get in and get out so as not to interfere with operations. MR. WEITZEL: Your idea is, even though you did use a high moisture lignite, you could store it under water if you eliminated surface moisture later. That is a new idea to me; I always had thought that you had to reduce the moisture down under 2 per cent, and to try to store it with anything more than that, any higher moisture, you would have to break the stuff loose again, as it gets so hard it won't move. MR. McCLURE: It might develop I am absolutely wrong; I am just saying what I observed, and I may have had some unusual condition, which I did not detect; something may actually develop which will make my statement of drying lignite entirely wrong. It was quite a surprise to me, surprise to every-

Jan 1, 1923

CHAIRMAN I. N. BAYLESS: Will you come to order, gentlemen? They told me that you had a very interesting meeting yesterday and a good time last night. Our program is rather long this morning, and I am not going to take up any of your time, as we got started a little late. I will ask Mr. Marchant to make a few announcements. (Announcements.) SECRETARY MARCHANT: I just noticed in this morning's paper a rather serious accident at Hobbs, New Mexico, in which George Kaseman, a former President of the Institute, and a loyal member ever since its organization, was killed. I think that this meeting should go on record and prepare a resolution of condolence, etc., and with your per- mission we will have the Committee on Resolutions do that. I assume that will be all right. CHAIRMAN BAYLESS: Our first paper and discussion this morning will be Education of the Miner, by Thomas Allen, Chief Coal Mine Inspector of Colorado. Mr. Allen.

Jan 1, 1938

By F. A. Young

A description of the dry process coal cleaning plant which has been built and operated by St. Louis, Rocky Mountain & Pacific Company at their mine at Brilliant, New Mexico, should at first be a description of the special machinery which is used in this process. This equipment consists primarily of screens for sizing the coal into six different sizes all smaller than 1 ½ inch and the pneumatic machines for cleaning each size. These machines are patented and were manufactured by Sutton, Steele & Steele of Dallas, Texas, until a few months ago when all rights of sale were acquired by the American Coal Cleaning Corporation. These screens, a plan of which is now before you, are called anti-gravity screens because the coal travels up hill. The screens which we have at Brilliant are 3 feet wide and 7 feet 4 inches long. They consist of one upper deck which slopes upward in the direction of the flow of the coal, at an angle of 12 degrees. This deck is a wire mesh screen the size of which determines the size of oversize from that screen. Under this is a lower deck with a slope of 7 degrees. This is a solid bottom and is for advancing the undersize to the next screen. On account of the difference in pitch of these decks they are about 11 inches apart at the discharge end, which allows the oversize to be taken off at one or both sides and the undersize to fall only a few inches on to the following screen. This is perhaps the most valuable point in this patent as it allows any number of screens to be placed on a-level floor, tandem in a battery without elevating or rehandling the coal in any way. The length of the screens corresponds to the proper spacing of the cleaning tables which naturally operate on the floor below. I know of no other screen which can be operated in this way. The coal is caused to travel by a reciprocating motion. A shaft as shown near the center of the screen box and under it has an eccentric at each side of the screen with connecting rods attached near the rear of the screen box. The screen box is attached to the stationary under frame by means of cast iron plates extending full width across the screen box. These are placed at an angle as shown so that the forward motion of the eccentrics causes the screen box to rise as it moves forward and the backward motion drops the screen from under the coal thereby causing it to advance. The coal advancing over the screen cloth in this rolling or jumping motion causes very perfect sizing. It should be stated here that very accurate sizing is necessary for the success of the cleaning tables. The stroke is 1 inch and the speed 350 revolutions per minute. In describing the pneumatic cleaning table, I place before you a plan furnished by the makers. The basic principle is that if a film of coal one to two inches thick and all of nearly the same size pieces is placed on a flat perforated surface and a large volume of air passed through it, the lighter particles which are the clean coal will soon find their way to the top of the film, while the heavier particles, or waste, will remain on the bottom. The machine is built with a perforated deck about 4 feet square under which is an air chamber and air duct connecting with a fan which is part of the machine. The deck of the table has a reciprocating motion the same as the screens already described, which tends to advance the product up a slight slope which is adjustable. The coal is fed at one corner of the table as shown and the deck slopes also away from the feed and at right angles to the reciprocating motion. On top of the perforated deck are riffles about 2 inches apart and running parallel to the line of reciprocating motion. These riffles are about 1/2 inch high at the fan and feed side of the table and taper to nothing at the far side. When the coal is fed on to the table, the air through the perforations tends to raise it 'and roll it over these riffles down the slope toward the clean coal discharge. The heavier particles do not get over the riffles so rapidly and the reciprocating motion is constantly pushing them

Jan 1, 1923

MR. ENZI: hank you very much. I'm sure there?s a lot of you out there just realizing that Rock Springs and Gillette is not one city. I'm sure there's a lot of you wondering why a person from a town who has the image in the national media that the town of Gillette has is talking to you about image. I had a person this morning ask me if Gillette wasn't the end of the world. The only response I can give is "no, but you can see it from there." We have been researched a lot and, I realize, we've been very lucky because I've observed that researchers cause cancer in rats. In fact a wonder drug is one that has no effect on mice. In fact I've been thinking of posting a sign in my office that would read "due to the large number of interviews by journalists who already have their articles written, we would most respectfully request that anyone wishing to insult the city of Gillette, please limit themselves to 3,000 words or 15 insults, whichever is shorter." I don't know if any of you saw the article in Playboy about three months ago on the city of Gillette. What you probably don't realize about that article is that that was an attempt by Playboy magazine to see if they couldn't change their image to a national municipal magazine. I think it's important to know Gillette is the frontier city, a pioneer city, it's a shopping center for northeast Wyoming and most importantly, we're the energy capital of the nation. We're on the threshold of the Powder River Basin and we will be the nation's energy solution. Besides coal, we're, already the heart of the state's leading oil producing area and we have vast uranium resources. But I, want to tell you the biggest resource that we have is, the people who have come to live in Gillette. You will find Gillette a busy, young, pulsating community. We're experiencing the excitement of growth. We're welcoming a higher percentage of newcomers than any other town in the nation. Yes, growth to us is exciting. Where else can you get ten years of experience in two years? We realize you can't maintain the status quo. Growth can be painful but not as painful as the alternative, recession and depression. For a little bit of background, we are now at 16,000 people and we have another 4,000 people who live on the outside but look like they live on the inside. The Census Bureau says that we have, 11,225 people but we have that many people in a traffic jam on the Douglas Highway in one day. I?ll , tell you about a few things happening in Gillette. I think it's very important to emphasize that I didn't , do these things; it's the youth and the energy of the community that has done these things. Right now the city of Gillette has 32 major projects underway. We have water for 50,000 people and we're seeking more water. The city in 1975 was 1 .8 square miles. Last year alone we annexed I square mile. We build 10 miles of paved streets a year. For the last 8 years we've doubled our parks' budget. I

Jan 1, 1982

The thirtieth regular meeting of the Rocky Mountain Coal Mining Institute was called to order at 11: 20 o'clock A. M., Wednesday, June 3, 1931, President G. A. Kaseman presiding: PRESIDENT KASEMAN spoke in part as follows: I have in mind to say a few words of welcome to the coal operators, but I am afraid that the words I might have said would be hardly appropriate, because I believe the coal operators are in the minority today. It demonstrates to my mind something that has been running through it for some little time. When the hard times came on a year ago, we thought we were going to get over it rather lightly. I recall at this time a year ago we thought that the depression was about at an end. The National Administration from Washington told us we had reached bottom and things were going to perk up, and for a few weeks or maybe a month or more there was a sort of optimism throughout the country. I had been East, and when I re- turned to Albuquerque I said to my friends and associates that things were getting better in the East and that they would soon be better out here and we will not have felt the hard times very much. But I have learned differently since. I have learned that hard times are no respecter of communities or corporations, or persons, or activities, and that we all suffer alike. On that account we find that our Institute is suffering just the same as other activities, whether national, state, local, social, or what- ever it may be. Our attendance is light or, that account. We all know when times are hard we have to stay at home and watch things closer than when they are good. And when they are good we feel that the machine will run of its own momentum and in this way we can get away to see what is going on in the world. When times are hard we have to stay at home and look after everything from day to day and hour to hour.

Jan 1, 1931

A Joy Global Inc. Company [ ] ? Joy Global Inc. headquarters located in Milwaukee, Wisconsin ? P&H Mining Equipment surface mining equipment and support ? Joy Mining Machinery underground mining equipment and support

Jan 1, 2007

Good Morning. Thank you for your kind welcome, Lyle and thank you for having me here today. I spoke at the fall meeting of the Utah state RMCMI in Price and it's nice to be invited back. I can see by the program that you have two great days of interesting and informative meetings, including the mine rescue team exhibition and the safety recognition award presentations. As you all know, I am here standing in for Dave Lauriski, who is in China with Secretary of Labor Chao. As you also know, Utah is near and dear to his heart - and so is the Rocky Mountain Coal Mining Institute. I want to assure you Dave would be here if it were at all possible. But it is my good fortune that I could come in his place. We have made great progress as an Agency thanks to the hard work and dedication of MSHA's employees. But we are always looking for new ways to solve problems and continue to send more miners home safe and healthy every day. And we have been working on some great ways to do that, including thinking strategically. During my presentation today I'm going to talk about where the Agency is in terms of our transformation to the MSHA of the 21st century, a little bit about how we got to be where we are, and then describe our roadmap to the future state. And I'm going to focus on the significance of our plan and the planning process to demonstrate the implication for the mining industry. Former President Dwight Eisenhower once said, "In preparing for battle I have always found that plans are useless, but planning is indispensable." Now I do like Ike, but I would have to take exception to the first part of the sentence. I have found plans and the planning process to be indispensable - the plan to give me a roadmap to my goal, and the process to focus me on the steps I must take to get there. We all know that having a strategic plan makes the difference between success and failure. We've seen it time and time again, in business, in our lives - and in government: Having a strategic plan is crucial to success. And the process of making the strategic plan is crucial to its success. Putting together a workable strategic plan - a good roadmap - that will successfully lead you to your goals requires a thorough, careful process that takes into account each factor that you may encounter along your way to success, as well as those with whom you will travel. In order to talk about our current plan I want to take you back to three years ago, when Dave Lauriski went to Washington to lead MSHA. He knew that change was in the air. Dave was confirmed as Assistant Secretary with 30-plus years experience in the coal mining industry, and more than 20 years of experience in dealing with

Jan 1, 2004

Earl W. Baker W. P. Bigler Lyman Fearn Leslie H. Johnson V. O. Murray Max C. Scheble Fred L. Smith who left the world better for their having lived in it . . .

Jan 1, 1986

of our good friends and fellow members: James Dalrymple, Sr. R. M. Perry A. E. Oliver R. M. Harding C. L. Oliver Arthur S. White Arthur N. Fancher A. E. Lindrooth D. A. Stout Clayton Morrison Frank O'Ryan Charles Billington who left the world better for their having lived in it.

Jan 1, 1935

PRESIDENT LITTLEJOHN: The paper of Mr. Emrick will now be open for discussion for about twenty minutes. The meeting is now open for discussion. MR. EMRICK: There is some question that may have occurred to you at different times, that is how are you going to tell when the bits are properly made? A fairly good rule to go by is when the used bits come out of the mine, if half of them are bent and half of them are broken, the average is pretty good MR. GEO. B. PRYDE (Union Pacific Coal Company): I would like to ask Mr. Emrick if he has any figures as to the saving of Dower with the different styles of its. MR. EMRICK: I suppose you mean chisel point bits and pick point bits? MR. PRYDE: Yes. MR. EMRICK: So far as I have been able to learn, the only reason why chisel point bits are used is to prevent coring that might be done by the cutter chain. The pick point bit, of course, is the proper thing to use. It can be used when the position of the cutter links in the cutter chain is right. I do not know of any figures which give power consumption ratings on the use of pick point and chisel point bits, but there are tests and ratings, etc., which have been taken- which have been tested as against different bits, which have been given proper clearances against bits not having been given proper clearances, and they will run,-in their saving in power, they will run 20 to 25 per cent. MR. A. C. WATTS (Chief Engineer, Utah Fuel Company) : I would like to ask Mr. Emrick if he has any record showing the saving in power on using the alloy steel chisel bits. I know that several experiments have been made; I do not recall the figures now, but we had a very decided saving in power. MR. EMRICK: I haven't any of the records. Do you think that is because of the steel that has been used? MR. WATTS: Well, they were all sharpened by the same man and used in the same machine, and at the same shop. I do not know the composition. It is "Red Star" Vanadium that I had in mind. MR. EMRICK: I have not seen any records. Some companies are using the tool steel bits because they stand up a little bit better. MR. BENEDICT SHUBART (Secretary) : I was going to ask Mr. Emrick about that question. There is one company that does not recommend tempering the bits. They recommend using not exactly self-hardening steel, but one that is bard enough without quenching-they use 80-90-point car- bon but about a 70-point manganese, not exactly self-hardening steel, but they do not temper this at all. Will Mr. Emrick state if a steel of that kind could be worked in the bit sharpening machine that his company makes, as it

Jan 1, 1925