The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 368
Fig. 91. which fasten It firmly over the centre of the instrument. Theattachment to the side, Fig. 92, is effected by means of a spindlefrom the attached telescope which fits into the hollow axis ofthe central telescope and is secured by means of a clip which MINING SURVEYING. 337 … M. passes through both the axis and spindle. A counterpoise issimilarly attached to the opposite side of the central telescopeto preserve the equilibrium. This latter form of attachment is more com-pact than the former, the principal objection toit being that a correction must be applied toeach…
Surveying
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