Kirkman, Marshall M. (Marshall Monroe), 1842-1921 · New York and Chicago, The World railway publishing company · leaf 114
Fig. 24. Fig. 25. Sectional View.Westinghouse Duplex Air Gauge. latter figure it will be seen that each pointer or gaugehand is acted upon independently of the other pointerby double Bourdon tube springs.A later style of duplex air gauge, called the Sema-
Locomotives
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