Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 332
nd insuring positive action. Spring-tension self-centering chart holder, which in-jures the accurate placement of charts.ininmatic release pen lifter, which keeps chart and in-:it neat and clean. i; clock movement with three point support.s have wide open scales, and bold face and skele-le to make… … DilYereutiui Recorders, This recording instrument is designed to record on achart the difference between two existing pressures. It is guaranteed to give satisfactory results under pres-sures from 0 to 4-inch head of i,vater, and up to any de-sired differential pressure and under static pressure…
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