Merriman, Mansfield, 1848-1925 · New York Wiley · leaf 208
first view the theodolite is not visible, but in the second it ijseen mounted upon the tripod. In both views heliotropesfor flashing to the adjacent stations may be distinguished.Detailed information regarding the erection of towers willbe found in the Report of U. S. Coast and Geodetic Surveyfor…
Geodesy · Surveying
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
