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 540
lways give a culmination and an elongation about thirty min-utes apart. This is very convenient, since it allows observations GE ODE TIC S UR VE YING. 509 to be made for latitude and azimuth at one setting with a suf-ficient intervening interval to complete one set of observationsbefore commencing… … --*/51 CEPH. Fig. 143. The position of 51 Cephei may be de-scribed with referenceto the line joining the pointers, in the constellation of theGreat Bear, with Polaris. Thus, 51 Cephei is to the right ofthis line, when looking towards the pole-star along the line, ata distance of about three times…
Surveying
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