A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 169
atest accuracyThe instrument now used for this class of work is similar in con-struction, but lighter. It has a telescope of 95 centimetres (37^ 158 FIELD ASTRONOMY. iuchos) focal length, 82 millimetres (3^ inches) objective, with amagnifying power of about 100 diameters. The telescope is re-versed… … base and lowered, thus reversing the telescope without jarring theinstrument. This instrument is used merely for time observations,having no micrometer attachment. 685. The Meridian Telescope. Fig. 4G8 represents the meridiantelescope, or universal instrument. It is used for the determination…
Surveying
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
