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 90
sen. Their purpose is to re-lieve any excessive pressure in the boiler, above the re-sistance at which they are set. When the pressure in theboiler exceeds the tension of regulating spring 16, itsvalve 4 is forced off its seat, allowing the steam to es-cape to the atmosphere, until such time as the…
Locomotives
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