Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 228
Fig. 15. Burts Solar Compass FIELD INSTRUMENTS 239 … Fig. 16. Transit with Solar Attachment The circles shown in the cut are intended to represent in miniature circles supposedto be drawn upon the concave surface of the heavens. 240 SURVEYING The solar compass may be used for most of the purposes of acompass or transit. Its most important use,…
Trigonometry · Surveying · Navigation
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