A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 38
orbehicd it. This lozenge-shaped target makes an ex-cellent object to point upon,and is only objectionablesince it is eccentric, and con-sequently observations uponit must be corrected when itdoes not face directly towardthe station occupied. 596. Requisites of observ-ing Signals. A good signal… … Fig. 441. Fig. 442, Fig. 443.
Surveying
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