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 131
or,however, then the vertical axis of the attachment also lies inthe meridian but points to the pole. It therefore becomes apolar axis about which the auxiliary telescope may revolve. Ifthis telescopic line of sight be at right angles to the polar axis,it will generate an equatorial plane. If the… … Fig. 19.
Surveying
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