A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 166
to be expected, make all theseadjustments over again; they can now be made with much lessdifficulty. It is important that a level should be in as perfect adjustment aspossible, but perfection in all respects is almost, yea, quite impossi-ble. Yet, with a level considerably out of adjustment, we can… … Let ah represent the true horizontal line, but suppose that the in-strument is so imperfect, or out of adjustment, that when the level-ing tube CD is horizontal, the telescope would point out the risingline DA, and the rise would be Aa. On turning the instrumentround and sighting to B, the rise…
Surveying · Navigation
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