. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . creased to about 554 ins. The shoeswith which the car was fitted were ex-tremely hard, and the brakes being ap-plied but a few seconds at each applica-tion, accounts largely no doubt for thesmall amount of brake shoe wear. C. P. Louis, Mo. A Puzzling Port. In the number of and Loco-motive Engineering for May, last, A. , Sydney, New South Wales,inquired as to the object of a smallport in the rotary of the equalizing dis-charge valve. I have been hoping that. Mr. Xewton


. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . creased to about 554 ins. The shoeswith which the car was fitted were ex-tremely hard, and the brakes being ap-plied but a few seconds at each applica-tion, accounts largely no doubt for thesmall amount of brake shoe wear. C. P. Louis, Mo. A Puzzling Port. In the number of and Loco-motive Engineering for May, last, A. , Sydney, New South Wales,inquired as to the object of a smallport in the rotary of the equalizing dis-charge valve. I have been hoping that. Mr. Xewton would make further in-quiries, as I think that the way inwhich he stated his question has ledyou into mistaking the port he in-quires about, for the warning port inthe American discharge valve, G 6. 172 RAILWAY AND LOCOMOTIVE ENGINEERING April, 1904 My reason for thinking so is this:New South Wales, like New Zealand, isusing the Made in London brake,which differs somewhat in constructionfrom the American, although in op-eration there is no difference. TheLondon equalizing discharge valve wasillustrated in the Air Brake Depart-ment of April last. Now, the London people are supply-ing two valves, the difference being inthe excess pressure arrangement, thefirst valve sent out has the D 8 excesspressure valves. The second valve has the seating andstuds as in the F-6 to receive train linegovernor, but instead of that excellentarrangement, there is a cast iron at-tachment containing the same excesspressure valve, the valve being in thiscase placed vertical. It is in this sec-ond


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