A Treatise on Mathematical Instruments: Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling, in Practical Astronomy, and for Measuring the Angles of Crystals: in which Their Construction, and the Methods of Testing, Adjusting, and Using Them, are Concisely ExplainedJ. Weale, 1853 - 170 pages |
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accuracy accurately adjustment already angle attached axis breadth bubble called chords circle coincide compasses consequently construction copy correction corresponding described direction ditto divided divisions drawing drawn edge equal error extent eye-piece face feet figure fixed foot give given glass greater half horizontal inches instrument latitude length lens lenses less light limb logarithmic lower marked means measured meridian method middle minutes moved nearly object observed obtained pair parallel passes pencil perpendicular plane plate position primary prism projection proportional radius rays reach reading reduced reflected reflector represent round rule scale screw sector seen side sines sliding square station straight subdivisions surface survey taken tangents telescope term third transverse distance triangle tube turning vernier vertical whole wires zero
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Page 37 - is equal to the two angles HiA and '-^ HAI; and because the vertical angles AVH and IVE are equal, and that the three angles of every triangle are equal to two right angles, therefore the two angles viE and sEH are, together, equal to the two angles AHv and
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Page 81 - Integral Calculus, in which the Principles are also clearly elucidated, by Homersham Cox, MA of Cambridge . 1«. 103. Collection of Examples of the Integral Calculus, vol. i. by James Hann, Professor, King's College . . . 1». 104. the Differential Calculus, vol. ii. by J. Haddon, MA, King's College . . . .Is. 105. ———— and First Mnemonical Lessons in
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Page 69 - TT is a telescope formed of two parts, connected by a spherical center-piece, into which are fitted the larger ends of two cones, the common axis of which is placed at right angles to the axis of the telescope, to serve as the horizontal axis of the instrument. The two small ends of these cones
Page 3 - and so on, and we have the following General Rule.—To take off any number to three places of figures upon a diagonal scale. On the parallel indicated by the third figure, measure from the diagonal indicated by the second figure to the vertical indicated by the first.