. Locomotive engineering : a practical journal of railway motive power and rolling stock . on.—Ed.] @ i i Port Morris Instruction Room. I-iliors: Through the progressiveness of Divi-sion Master Mechanic Lewis, and Gen-eral Air Brake Inspector McKenna, wehave been given a neat air brake instruc-tion plant at this point. I send you pho- tographs for publication, We have no, 1 ing and 1 epair plant yet. hut probablywill have one soon. Tins .111 1- used for instruction pur- ■ ■ nfl ^1 •*> 1 & W. RY. AIR-BRAKE ROOM, PORTMORRIS, X. J. poses only. Tt is fitted with an 8-inchpump, mam
. Locomotive engineering : a practical journal of railway motive power and rolling stock . on.—Ed.] @ i i Port Morris Instruction Room. I-iliors: Through the progressiveness of Divi-sion Master Mechanic Lewis, and Gen-eral Air Brake Inspector McKenna, wehave been given a neat air brake instruc-tion plant at this point. I send you pho- tographs for publication, We have no, 1 ing and 1 epair plant yet. hut probablywill have one soon. Tins .111 1- used for instruction pur- ■ ■ nfl ^1 •*> 1 & W. RY. AIR-BRAKE ROOM, PORTMORRIS, X. J. poses only. Tt is fitted with an 8-inchpump, mam reservoir, D-5 brake valve,driver brake, a plain sectional triple oper-ated by another plain triple, sectionalquick action triple and brake valve, andthree freight brakes, complete, with pip-ing, etc. All the pressures are connectedup to duplex gages. There is also thesignal apparatus, working and in section,so that it can be easily understood. Theplant, while small, is doing good work,and we think it is a good investment. J. A. Alpaugh,A. B. Instructor. Port Morris, N. L. .V \V. RY. AIR-BRAKE ROOM, PORTMORRIS, X. -I. More About Compressed Air. Editors: In September number, question 105, awriter asks will an auxiliary charged with50 lbs. pressure put as much pressure inthe brake cylinder by making a 10-poundreduction in the train-pipe as an auxiliarycharged with 70 pounds pressure says it will, and B says it will not. Theanswer says A is right. According to my ..pinion I! is nearer right than A. lor ]..wing reasons in figures: Formula : /, = - where p — the origi. nal pressure, />, = final pressure, 7 =• vol-ume corresponding to the pressure/, andt/j = volume corresponding to the press-ure />,. Taking a 10 x 24-inch auxiliary rcscr-voir and an 8-inch brake cylinder with 7-inch piston travel in both cases, 10 X 10 =100 x .7854 = 78-54 X 24 = cubic inches contents. The brake-cylin-der. 8-inch diameter and 7-inch travel,would conta
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Keywords: ., bookcentury1800, bookdecade1890, bookidlocomotiveen, bookyear1892
