. American engineer . eds, from starting up to SO miles per hour, of thislocomotive and the average of five other representative Pacifictype locomotives of recent construction and about the same totalweight is given in the following table: Theoretical tractive efforts. (A. L. formulae.) Difference in tractive f ^ —^ effort in favor Speed, St. Louis Average of 5 Pacifies of Frisco. M. P. H. and of ,. ^ .^ San Francisco. same weight. Pounds. Per Cent. Starling 40,800 34,140 6,660 JO 24,760 22,670 2,090 35 21,210 19,540 1,660 40 18,560 17,110 1,450 45 16,440 1
. American engineer . eds, from starting up to SO miles per hour, of thislocomotive and the average of five other representative Pacifictype locomotives of recent construction and about the same totalweight is given in the following table: Theoretical tractive efforts. (A. L. formulae.) Difference in tractive f ^ —^ effort in favor Speed, St. Louis Average of 5 Pacifies of Frisco. M. P. H. and of ,. ^ .^ San Francisco. same weight. Pounds. Per Cent. Starling 40,800 34,140 6,660 JO 24,760 22,670 2,090 35 21,210 19,540 1,660 40 18,560 17,110 1,450 45 16,440 15,200 1,240 50 14,660 1,010 These tractive efforts are calculated in accordance with theadopted practice of the builders which employs speed factorsbased on the piston speed corresponding to the speed in milesper hour. The average weight of the five locomotives is 2SS,S0Olbs., as compared with 260,S0G lbs. for the Frisco. The lightestweighed 9,000 lbs. less than the Frisco, and the heaviest 1,500 Pacific Type Superheater Locomotive of Exceptional Power at IVloderate Speeds. shaft from the shop engine. Such is the case in our shop, andit was found necessary to rig up an air motor drive, as shownin Fig. 5. The motor was in so as to muffie the noise andkeep out the dust. It will be noticed that it drives two emerywheels. The motor and the emery wheel stands were installedat a cost of about $15 and the arrangement adds greatly to theefficiency of the tool room. Coin Oper.\ted Speed —There has been designed inEngland an arrangement whereby a passenger on the train whois curious concerning the speed at which he is riding can, byinserting a coin and pressing a button, have his curiositygratified. This idea was conceived by H. Weymouth Prance andconsists of a speed indicator belted to the axle through themedium of a clutch. Normally the speed indicator is out ofaction, but when a coin is inserted in the machine, it releasesa latch and permits
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
