A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 416
this kind have occurred, producing serious results. In one form of miningtransit an extra telescope isattached on one side, asshown in Fig. 5To, and isbalanced by a weight on theopposite side. The advan-tage of this form is, thatsights may be taken verti-cally up or down, as is some-times necessary… … 40G UXDERGROryD OR MIXING SURVEYING. The diagonal prism, shown in Fig. ^11, Part I, may ho usedwith advantage on the extra telescope. 843. Taking the Sights. Tlie beginner will at first have sometrouble in catching the light through the telescope. A little prac-tice will overcome this. Hold a lamp…
Surveying
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