Page Four lttllbl‘llhlhh Thrill diltlll lid llhl‘llhl db idliil’l lilbhl‘lild Engineering Societies Hear Linhuflelt Engineer MOVERS SHOWN Members of the Armour branches of the various engineering societies heard an illustrated lecture, which was given by R. F. Bergmann, assist. ant chief engineer of the Link-Belt Company. The subject of his talk was “Material Conveyance Equip- ment." He was secured through the efforts of Dean llcald and Mr. R. P. Petersen, an Armour alumnus. The first part of the talk consisted in slides illustrating the different types of conveying machinery. The three main types of conveyors are the screw, belt, and chain. These were desc "bed in detail in the slides and commented upon by Mr. Berg- mann in order to enlighten the group. The screw conveyor essentially con- sists of a central shaft or pipe around which a sheet steel spiral is wound, and which rotates in a V-shapcd trough. Material is dragged through the trough by the action of the screw. Describes Screw ‘Conveyor There are two general forms of screw conveyors: The full—blade spiral, and the ribbon blade. In the former the blade, or flight, extends and is attached to the central shaft. In the latter a narrow spiral band is connected by gudgeons to the shaft but does not touch it. The full bladc screw is used for dry, granular ma- terials, such as coal, and the ribbon conveyor is used for handling sticky materials such as sugar, wet clay, etc. The full blade screw is used also in an enclosed trough for raie. ing crushed materials vertically to upper floors. The belt conveyor consists essenti- ally of a carrying belt, intermediate rollers or idlers for supporting the belt; head and tail pulleys and the supporting structure. The belt may be of canvas, rubber, impregnated layers of cotton duck or a thin fiat steel hand. For carryingr bulk ma- terials the belt is generally given a trough shape by the idlers, and for transporting- packages the belt is usually flat. Special Discharge Methods Troughing idlcrs usually consist of a series of three or more pulleys mounted on a shaft in one plane, the whole being supported on a board or a steel member. Intermediate rol- lens for flat belts generally consist of a straight-face steel tube carried on a shaft with journals at either cnd.‘ The discharge of materials from a belt conveyor is effected by a device known as a belt tripper. It consists of two superimposed pulleys with their shafts and bearings mounted: on a frame, so that the load is car-1 ricd over the upper pulley and dis- charged into a chute. The frame may be fixed, or it may be mounted on a wheeled carriage which is movable on I rails from power supplied by the belt. l A very important type of chain? conveyor is the pivotedabucket car-l ricr. This conveyor consists of two} parallel strands of steel or malleable ; roller chain between which i. mounted a series of sheet steel, cast, iron or malleable iron buckets. Thel buckets are made so that each bucket in the series overlaps the one preced~ , ing, thereby making an articulatedl line without gaps. The buckets arel suspended from their central points: and are free to swing so that their vertical center lines are always nor- mal to a horizontal line. This ar- rangement permits the conveyor to be used simultaneously for horizontal I conveying and for elevating. I I iron Various Types Used The discharge of the buckets is ef— : fected by turning them over on a spe- cially. designed dump carriage which is mtlvable on the same rails that carry that conveyor. Each bucket has a lug on its side, and this lug com-l ing in contact with a curved sectionl of the discharger causes the bucket to turn completely over, emptying its contents into the receiver. A continuous elevator consisting of a chain or belt having buckets at— tached at intervals is known as a bucket elevator. The head and foot are mounted in a frame for support- ing shaftirg and pulleys. The buck» ets may be spaced or continuous on the belt. The latter are known as continuous-bucket elevators, and the former as spaced—bucket elevators. Spaced‘bucket elevators are of centri- fugal discharge type and are relative- ly high~speed machines. Continuous- bucket elevators are operated at a low—speed. These elevators are used for all bulk materials that do not ad- here to the buckets. Skip~hoist Is Automatic An apparatus for the internnttent hoisting of bulk material, consisting of a tower with guides, or an in- clined runway with trucks on which the load-carrying bucket travels is known as the skip-hoist. Steel wire hoisting rope leads from the bucket over sheaves at the top of the tower and thence to a single drum hoisting engine. A hopper with a loading spout and gate at the bottom is ar. ranged for loading the skip bucket when it is in the pit, and it is emptied at the top by dumping. The automatic skip operates con- tinuously, starting: up when the load in the skip has become equal to a predetermined amount, shutting off the loading chute, dumping at the top, waiting: a sufficient interval for all the contents to pass out and re- turning to the loading pit at the bot- tom, where it automatically opens the loading gate and is ready to repeat the cycle. It was used for conveying largc quantities of limestone to the top of hoppers in the movim: picture of the Marblehead Lime Company. Movie: Show Application In certain types of conveying mu- chinery it is necessary to remove pieces of iron from a stream of bulk material so as to prevent damage to machines to which it may be pass— ing. To do this a magnetic separator is used which consists of a magnetic pulley for a belt conveyor, in which the iron and steel are held againstlwas necessary to perform. ARMOUR TECH NEWS SIDELINES (Continued from page 1) WITH THE presentation of Major Fordney to the student body, the fac- tor of personal element was no longer omitted from the subject of the stratosphere flight. We have read accounts of that scientific undertak- ing but to no avail as compared to the satisfaction and benefits derived from the narrations of the “man in- volvet.” We fully appreciate that educational incident and hereby ex. tend a sincere vote of thanks to the member of the faculty who was in- strumental in securing that valuable speaker, Major Fordney. THE QUESTION of the sale of beer over bars is again before the state legislature. The House passed the Devine bill last week, amending the state liquor control act to permit the sale of beer over bars. From all appearances it never was against the law. Howcver, Governor Homer sub- mitted a message of opposition and threatened to veto the bill. The gov. ernor said, “It is important we be consistent and not violate our cam- paign pledges, because we desire to retain the confidence of the people." There’s not much confidence left to retain, but then that makes a good he. ' agument for reelection. the belt while it passes around the pulley after it has delivered the mar terial. In the moving picture of the Mai" blehead Lime Company in action, ev- eryone of the types of conveyance heretofore mentioned were seen in operation. The picture showed the application of each one of these ma— chines to the type of work which it WW I allies News ll MWWW I “Wally” Sobcl claims to be the‘ only fellow who can be completely drenched, without having his . . . . put in the sink. While arguing with “Speed" Forsythe over a bucket of Ill-LO, “Speed”, who for once lived up to his name, did a presto change, and low and behold “Wally" looked more like a drowned vat than a rat could! Now that all you. loyal ARX sup— porters have heard the good news, you had better will 14)) that "sweet young thing" of yours and make a date for March 9, before someone else olocs. As you. all know, the dance this year is 10 be held at the Tower and Town Club. (It’s a big place, not a small place). Be sure and. get your lie/cots NOW us they are going fuel. It loo/tn lilac .KUK won't, be bar/r 7'07. school newt year. Since he reduced the 20"- u/' his colored wrtler, he has lost his main income. “No money, no school," says KUK! And the fresh are still studying their composition plates. The sophs have challenged the juniors to a track. ”100’, and not In be out done, the juniors in. [urn rim!- lengod (In; cop/is lo « tennis match. 31/ o. popular vole, no Tailor men can commie. Loo/rs like the juniors have it in Ihe 1mg! Get one! AHSMME Members in Essay @onteei (Continued from page 1) considered shall include papers sub- mitted by student members in com» petition during the year ending June 30, 1934. 3. The awards shall be given for the best papers, adjudged from the standpoint of applicability (practical or theoretical), value as a contribu- tion to mechanical engineering“ liter- ature, completeness, originality ol? mutter, and conciseness. Al. All papers should be sent to the secretary of the society and should be clearly marked on the out side, “Attention of Ernest Hartford for the Committee on Awards." They must be in his hands by June 30. 5. Only papers by single authors will be considered. (i. The paper should not be shorter than 2,000 words, typewritten on standard paper (8% by 11 inches), and should have the name and ad! dress of the contestant with the name of the college, at the top of the first sheet. Student members of the A. S. M. E. who are interested in competing, may obtain a very complete bibliog- raphy on the subject for the essay. Convention in April “Leonardo (la Vinci” Stewart San- lord Granger has just completed the west facade of the spacious drafting room with a few of his famous fres- cos. As yet the price of his dynamic work has not been set, but should be somewhere in the millions. l-low ‘ about paying- some of your creditors “Stew"?! mills cigarette that‘s Mitosis. maths cigarette that resins BETTER. © 1954, Motion a2 MYERS TOBACCO Co. The annual A. S. M. E. conven- tion will be held in Chicago this April. Fifteen mid~west colleges will be represented. Each college pre- sents a fifteen minute paper on some engineering subject, to be written \by a student member of the local I chapter of the A. S. M. E. The paper ,is to be selected by a committee of l the college’s faculty members. Tuesday, February 27, l934 Laws Of Probability Dioceompe fiflrldhllrtg With an understanding of the laws of probability. it is absolutely ab- surd to indulge in a game of chance with an expectation of making money, or Words to that ailect, was what Dr. J. S. 'l'aylor, professor of mathe- matics at the University of Pitts- burgh, stated. He also went on to say that the surest way to reduce the evils of gambling, is to teach the peo— ple how the laws of probability oper- ate. Because people have heard that the probability of a tossed coin falling- hends is one-half, they jump to the conculsion that this means that the number of heads and tails will be ap- proximately equal for a large num- ber of tosses. This, he said, is very far from the truth. Probability Val-res Are Ratio: Dr. Taylor then said that the prob ability values state facts concerning ratios, and not differences, because as the number of tosses increases, the number of heads divided by the num- ber of tosses approaches one-half, but the difference between the number of heads and tails, does not approach zero. This difference fluctuates very it'- regularly and the important feature is, if you toss long enough, there will come a time when the difference be- tween‘ the heads and tails is very great, while the ratio of the number of heads is still very close to one- half. Gambling Concerns Favored Gambling houses or devices are al- ways favored by the odds, and result in a loss for the person who plays for any considerable period. You hear better. OF EACH to try them. in a lot today about balanced diet»— . . and there’s something too in the way lobazms are bal— anced that makes a cigarette milder and makes it taste l keep coming back to that statement on the back ofthc Chesterfield package—- @ESTERFIELD" ~~¢GARETTE$ ARE A BALANCED BLEND OF THE FINEST AROMATIC TURKISH TOBACCO AND THE CHOICEST OF SEVERAL AMERICAN VARIETIES BLENDED IN THE CORRECT PROPORTION TO BRING OUT THE FINER QUALITIES TOBACCO. REG. U. S. PAT. OFF. We believe you’ll enjoy Ehcstcrficlds and we ask. you;