Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 54
FIG. 9. TRIANGULATION STATION AND SIGNAL, ON ALASKA COAST. … FIG. 10. MEASURING ANGLES WITH THEODOLITE AT TRIANGULATIONSTATION ON ALASKA COAST. (37) Topography 39 ground and the location described so that they can befound at a future time. At long intervals in the surveybase lines are laid out and carefully measured with steeltape. Signals are erected over…
Nautical charts
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