Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 147
atthe time the full pressure of steam in the boiler acts upon Fig. 53 AUXILIARY SPRING PRESSURE GAUGE, SECTIONAL VIEW the spring, tending to straighten it. The end or ends ofthe spring being free to move, and connected by suitablegeared rack and pinion with the pointer of the gau^re, this ^ 134… … Fig. 54 AUXILIARY SPRING PRESSURE GAUGE Steam gauges should be tested frequently by comparingthem with a test gauge that has been tested against a col-umn of mercury. The steam gauge and the safety valve should be com-pared frequently by raising the steam pressure high enoughto cause the valve to…
