. Locomotive engineering : a practical journal of railway motive power and rolling stock . the sig-nal on the cars behind are of course ren-dered inoperative thereby. (no) J. B. L., Kansas City, Mo., asks:Was not the first kind of retaining valveone with a spring arrangement inside, in-stead of the weight like is now used? A.—Yes. The first retaining valve used con-sisted of two brass disks held together bysmall screws. Inside was a copper dia-phragm to which was fastened a small pinvalve. On the other side was a springhaving 10 pounds resistance. In the de- 401 condition either of these packi
. Locomotive engineering : a practical journal of railway motive power and rolling stock . the sig-nal on the cars behind are of course ren-dered inoperative thereby. (no) J. B. L., Kansas City, Mo., asks:Was not the first kind of retaining valveone with a spring arrangement inside, in-stead of the weight like is now used? A.—Yes. The first retaining valve used con-sisted of two brass disks held together bysmall screws. Inside was a copper dia-phragm to which was fastened a small pinvalve. On the other side was a springhaving 10 pounds resistance. In the de- 401 condition either of these packings willprove far more satisfactory than shot pack-ing, especially if a well-oiled swab ofcandle wicking be kept on the rod. (112) J. F. R., Fond du Lac, Wis.,writes: Nearly all of our air pumps that arepacked with shot are groaning very that on account of shot packing throw-ing the pump out of line? A.—Possibly,and especially if new shot is added to theold packing; but the most likely cause isthat the packing blows and wastes air onthe up stroke. When the shot is squashed. INTERIOR VIEW OF INTERNATIONAL CORRESPONDENCE SCHOOLS AIR-BRAKE INSTRUCTION CAR, NO. IO5. pounds brake cylinder pressure, an in-crease of about 10 pounds, or 20 per cent,over and above a service application, andthat a passenger car length of i-inch pipewill do the same for its brake. (109) B. M. C, Springfield, Mass., asks :What is meant by the cross-over hose,as mentioned by Mr. Sullivan on page 21cof May number? A.—The cross-overis a short length of air hose, about 8 or 10inches long, with an air-brake coupling-head on one end and a signal-line couplmgon the other. Should the train pipe of theair brake become disabled on a car, thesignal pipe may be used as a train pipe onthis car and brakes used to the rear of the vice was a cock, so arranged that whenopened, the exhaust cylinder air passedfreely to the atmosphere. When the cockwas closed, the retaining valve was throwninto operation. (hi)
Size: 1792px × 1395px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
