File:American engineer (1912) (14781486433).jpg

Identifier: americanengineer861newy (find matches)
Title: American engineer
Year: 1912 (1910s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York, N.Y. : Simmons-Boardman Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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sed. Fig. 2 showsa reamer for facing ofif the steam valve seat of the governorwhich is often out of line with the valve guide due to the warp-ing or springing of the metal. The reamer is screwed on theshank so that it may be used with a shank that exactly fits thevalve guide. Where the valve seat is cut too deep, a facingreamer should be used to cut it down. Fig. 2—Arrangement for Lifting Air Pumps. of two supports made of 2 in. x ~)(x in. bar iron which hookon the lower steam cjdinder head studs of the pump. Slidinglugs slip over the top studs and are held in position by a Equipment on the Feder.^ted Malay States Railway.—InFebruary. 1912, the Federated Malay Railway had in service 114locomotives, of which 33 were of Pacific type, 38 of the ten-wheel type, and 43 were smaller engines. On the same datethere were 2,229 freight cars of various types and 271 passengercars. 640 AMERICAN ENGINEER. Vol. 86, No. 12. ^JOJJ.^ 3AIJ.ODJI Q ^ Q Qj 5 § § «> § ^ ^^ cr S «■ ^ s 5 !5 i^
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\ December, 1912. AMERICAN ENGINEER. 641 CHART FOR OBTAINING TRACTIVEEFFORTS BY I.. R. POMEROY.* A locomotive tractive effort formula contains four variablesand in the preliminary investigation of a proposed design itnot infrequently is desirable to ascertain the etTect of changesin each or all of them. While the tables available permit a readydetermination of tractive eflfort for exact sizes, it is sometimesnecessary to know the effect of an increase of one-quarter inchin the diameter of the cylinder or the wearing down of the tireswhich would decrease the diameter of the drivers by smallamounts. Furthermore for a complete range, the tabular ar-rangement of this data makes a fairly voluminous pamphlet.In view of these facts the accompanying chart has been pre-pared and will be found to give results that are accurate within500 lbs. It is based on a mean effective pressure equal to 85per cent, boiler pressure. In obtaining the tractive effort of an existing locomotive thechart is enter

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