Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 40
Fig. 15. Burts Solar Compass FIELD INSTRUMENTS 31 … Fig. 16. Transit with Solak Attachment The circles shown in the cut are intended to represent in miniature circles supposedto be drawn upon the concave surface of the heavens. 32 SURVEYING The solar compass may be used for most of the purposes of acompass or transit. Its most important use,…
Surveying
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