A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 77
tor stands.This lever is made of a pieceof steel tubing terminatingin a hickory handle. Alongthe upper two thirds of thetube is cut a screw thread on which a wheel nut plays freely.This nut gives a vertical motion to a gimbal-jointed support to whicha spring balance is attached. Thus all the… … 4 SUPPORTING AXD MARKmO POSITION OF TAPE. 67 The balance should be one from which ounces can be read, asthe operator can easily hold the tension within an ounce. In orderto prevent overstraining of the tape by accident, a breaking link isinserted between the end of the tape and the balance. It is…
Surveying
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