Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 161
ll that is nearly a hemisphere withthe plane of its base horizontal. This ball or hemispherical nutis scrjag5d fast to the smaller base of a solid conic spindle, thatpas^ tlirough the curved part of the plate DE. To thissg||dle is firmly attached the second horizontal plate, FG. 154 ELEMENTS OF… … Fig. 85. called the limb of the instniment. Fitted to the upperconical surface of the main socket is a second socket to whichis united a thin circular plate, A A, called the Vernier Plate, SEC. I.J surveyors transit. 155 which rests on the limb of the instrument and carries a compass-circle,…
Surveying
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