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36 inches appear running lengthwise Average thickness backbone mark belting shall conform belting the strips belting.—This type bone center strips butt end carbon cemented cent stretch CHEMICAL TESTS clamps cross section different grades double belting dressed or waterproof end to butt evapo exceed 10 feet feet or fraction filter paper filtrate five test specimens flask forms as specified fraction thereof Free Mineral Acid g of leather gauge marks grades and thicknesses grain side grease grub holes hereinafter specified ignite including the lap joined shoulder end laps and plies Length of laps mark shall appear methyl minimum length Nominal Width number percentage plies of double pounds per square red heat running lengthwise approximately sample second-quality single belts Single ply solution square inch stuffing content tanning materials tensile strength tensile stress titrated type of belting unsaponifiable matter Vegetable Tanned Water Absorption waterproof belting waterproof dressed weight Width of belting