A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 88
e greatest importance attached toseveral other instruments, which will be referred to in this work, wenow make an effort to give the learner a clear comprehension of it. Let AB represent aportion of an arc and EDthe vernier whicV is con-ceived to be attached toan index bar and madeto revolve with… … 86 SURVEYING. scale to see what division of it makes a right line with some divisionon the limb, suppose the division 8 on the vernier coincided with adivision on the limb then the index would mark 10° 8. To understand the philosophy of this : Let x represent the valueof a division on the vernier…
Surveying · Navigation
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