. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . tan. 0 — tan. 0 tan. 0 — tan. 0 In this demonstration we putthe radius = 1 : but suppose theradius = 10000 equal parts, which we take as a whole number, Ft = —- ; . Now if tan. 0 measuics 2 in. 4-lOths and GO from the micrometer circle, and tan. 0 — tan. 0 then the horizontal range 1774 GÜ GUNPOWDEE. 1775 tan. e = 2 in. 4-lOths and 48 from the micrometer circle, then tan. 9 — tan. 6 = 2469 — 2448 = 21, and as r = 3 yds., we have K = ——— = 1429 yds.
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . tan. 0 — tan. 0 tan. 0 — tan. 0 In this demonstration we putthe radius = 1 : but suppose theradius = 10000 equal parts, which we take as a whole number, Ft = —- ; . Now if tan. 0 measuics 2 in. 4-lOths and GO from the micrometer circle, and tan. 0 — tan. 0 then the horizontal range 1774 GÜ GUNPOWDEE. 1775 tan. e = 2 in. 4-lOths and 48 from the micrometer circle, then tan. 9 — tan. 6 = 2469 — 2448 = 21, and as r = 3 yds., we have K = ——— = 1429 yds., the horizontal range very nearly. The ZÍcalculating instrument before alluded to, Fig. 3380, forms a vast variety of similar triangles,which instantly give a fourth proportion to tan. 6 — tan. 6, r, and 10. The divisions on the sidesB, B ; D, E, are all equal and not in logarithmic order. The calculating instrument consists ofa circular disc F G attached to a vertical limb B B, upon which two horizontal limbs D and E,with clamping screws, slide vertically ; upon the lower branch of the limb B B a small marker a,with clamping screw, slides vertically ; a diagonal bar A A revolves upon the centre point of thecircular disc ; two small tables of tangents F and G are engraved upon the disc. The instrumentis worked as follows ;—While the fiist observation is being taken on the higher level, move thehorizontal limb E
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
