Topographical drawing and sketching : including applications of photography (1888)
Reed, Henry A. (Henry Albert), 1844-1930 author · New York : John Wiley & Sons, 15 Astor Place · leaf 263
. The milled head, shown at the left in Fig- 35> serves to release a hinged brass clamp, or cleat, when the holder is to be inserted, and to secure the holder after insertion, so as to entirely exclude the light. Several plate-holders are used, and are easily packed for transportation. 39. Scale of… … The notches in h correspond to divisions Fig. 41. of 1 "grade," or of i°, as the case may be, to a radius = the distance from the plate-holder to the axis of rotation of the ob- jective; and the notches in v, to part of this distance. Projecting points at p mark the horizon, or HH' . {Note. — On…
Topographical drawing · Photographic surveying
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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