Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules (1908)
National correspondence school of railroading, Chicago. [from old catalog] · [Chicago] · leaf 117
Air and Sand.In order to prevent the air-valve from being overlookedby the engineman or allowed to remain open longer thanis necessary, a device, known as a warning port, isprovided in the valve or handwheel, which sounds awarning at all times when the valve is open, unless pre-vented from sounding… … AIR SANDERS. 107
Locomotives
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