Text Book of Military Topography ...H.M. Stationery Office, 1883 - 226 páginas |
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Text Book of Military Topography: Including the Courses of Instruction at ... William Hamilton Richards Sin vista previa disponible - 2018 |
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accuracy adjustment altitude aneroid artillery barometer base bearing calculated centre chain circle clinometer coincide column construction contours correction difference of level direction distance distant points diurnal motion drawing drawn edge equal feet forward angle graduated Greenwich mean ground heavenly body height hill horizon glass horizontal equivalents horizontal plate hour angle inches index error instant instrument intersection laid latitude length local mean longitude magnetic north marked measured mercury meridian micrometer mile military Nautical Almanac object observed offsets operation pacing parallax parallel perpendicular picket plane table pole pole star position Price protractor represented right angles right ascension road ruler scale of horizontal sextant shade shown side sidereal sketch spirit level star station sun's survey surveyor taken telescope theodolite tion traverse line triangulation true north upper usually vernier vertical interval yards zenith zero line
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Página 142 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. By Theorem II. we have a : b : : sin. A : sin. B.