. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FIG. I. pound, which is generally a mixture ofoil and grease. Leather rendered airtight by this process is also waterproof,and the necessary softening with watercannot be efifected. Oak and hemlock leather so treatedwhen formed into cups are found to benot only hard and brittle, but are liableto leak air, and the efifort to impreg-nate them with air-proofing materialonly causes the cups to swell and thuslose their shape and the uniformity ofsize is destroyed. These are some ofthe difficulties
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FIG. I. pound, which is generally a mixture ofoil and grease. Leather rendered airtight by this process is also waterproof,and the necessary softening with watercannot be efifected. Oak and hemlock leather so treatedwhen formed into cups are found to benot only hard and brittle, but are liableto leak air, and the efifort to impreg-nate them with air-proofing materialonly causes the cups to swell and thuslose their shape and the uniformity ofsize is destroyed. These are some ofthe difficulties which have stood in theway of the manufacturer in his en-deavor to produce air-brake packingwhich will stand the exacting servicerequired in air-brake work. The process by which Vim air-brakecups are made is not only interesting,.-iS it surmounts these several obstaclesto the production of a good packing,but the process is scientific tanning of Vim leather is really amisnomer. The word tan refers to the ac-tion of tannic acid on the hide. In the Vim leather fibers may be had by agl
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Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
