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accuracy accurately adjustment already altitude angle appear applied attached axis azimuth bring bubble called carries circle coincide collimation columns compasses consequently construction correct cross wires described determined difference direct distance ditto ditto ditto divided division drawing drawn edge equal error exactly extent eye-piece feet field figure fixed give given glass graduated greater half horizontal inches instrument latitude length lens less light limb lower marked means measured ment meridian method microscope middle minutes moved nearly object observed obtained parallel pass pencil perfect perpendicular piece plane plate position prism radius rays reading reduced reflected represent round rule scale screw seen sextant side sines square staff station surface survey taken taking tangent telescope third transit transverse tube turning vernier vertical whole zero
Page 5 - To which is added, a description of the Principles and Practice of Isometrical Projection. By JF HEATHER, MA -With 14 Plates.
Page 98 - ... of this field of view. We must therefore place some fixed point in the field, of view, and in the focus of the eye-piece, and the point to which the measurement will have reference will be that point of the object viewed, which...
Page 6 - Gd. 131. READY-RECKONER FOR MILLERS, FARMERS, AND MERCHANTS, showing the Value of any Quantity of Corn, with the Approximate Values of Mill-stones & Mill Work.
Page 11 - THE ENTIRE SERIES IS FREELY ILLUSTRATED ON WOOD AND STONE WHERE REQUISITE. The Public are respectfully informed that the whole of the late MB.
Page 5 - Gd. 55. NAVIGATION ; the Sailor's Sea Book : How to Keep the Log and Work it off, &c. ; Law of Storms, and Explanation of Terms, by J. Greenwood. 2s.
Page 24 - From the center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle ag i.
Page 143 - ... of them, those which apply to the eye-end of the telescope will answer much better ; the former having their errors magnified by the power of the telescope, will, in proportion to this power, and those errors, be less distinct than the latter. " In taking distances, when the position does not vary from the vertical above thirty or forty degrees, the handles which are attached to the circle are generally most conveniently used ; but in those which incline more to the horizontal, that handle which...