. Locomotive engineering : a practical journal of railway motive power and rolling stock . ondition, as the black hand is con- your black hand. If it falls rapidly, test is all right; but if it fallsvery slowly I should conclude it betterto be governed by speed of the pump insupplying the leaks than by the test ofthe falling black hand. A. W. ConOM. MfaihnlU, Pa. A Qood Attempt. Editors: In answer to Mr. E. Milhones prob-lem, on page 157. March number of Loco-motive Engineering, I would say: Inconnecting engineers valve a leak wasleft in one of connections to equalizing this leak
. Locomotive engineering : a practical journal of railway motive power and rolling stock . ondition, as the black hand is con- your black hand. If it falls rapidly, test is all right; but if it fallsvery slowly I should conclude it betterto be governed by speed of the pump insupplying the leaks than by the test ofthe falling black hand. A. W. ConOM. MfaihnlU, Pa. A Qood Attempt. Editors: In answer to Mr. E. Milhones prob-lem, on page 157. March number of Loco-motive Engineering, I would say: Inconnecting engineers valve a leak wasleft in one of connections to equalizing this leak being about equal to air passingfeed valve. H. Thornburg,Paducah. Ky. N., C. & St. L. Ry. i i i Handling Long Air-Bralted Trains. Rditors: Referring to E. W. Pratts handling ofsixty cars of air, that appeared in yourFebruary number, I think it is very in-structive to a great many that may becalled out some time with a train. Nevertheless, I think there isa mistake made in cutting driver brakesinto straight air in order to hold themset while train brakes are AN INTERIOR VIEW OF THE NORFOLK & WESTERN R. R. -illt BUAKE INSTRUCTION CAR. SENT BY JOHN W. WARD. Tiected to chamber D, it has no connectionwith the train line when the valve is onlap, and any leak it may show is not theleak of the train line so much a :ie leakof the packing ring of equalizing piston18, and if it were tight, as I have seen,the train line might leak to 0 and theblack hand still remain the same. Thenagain, the train line might fall 20 poundsand the black hand show only 5 or 10pounds. Now, this being true, would it not bea good plan to test your valve first? Putit on lap after making a 5 or lo-pound re-duction, then let some air out of yourtrain line with the angle cock, and watch reservoirs. This leak might also havebeen one of the unions in air pipe to train-line pointer (No. 15 or next to gage).The feed valve attachment not being ad-justed, the tension of spring 68 happenedto be ab
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