Text Book of Military Topography: Including the Courses of Instruction at the Royal Military Academy ... for Garrison Instruction Classes and for Examinations for PromotionH.M. Stationery Office, 1888 - 236 pàgines |
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Text Book of Military Topography: Including the Courses of Instruction at ... William Hamilton Richards Visualització completa - 1888 |
Text Book of Military Topography: Including the Courses of Instruction at ... William Hamilton Richards Previsualització no disponible - 2018 |
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accuracy adjustment altitude aneroid artillery barometer base bearing calculated centre chain circle clamping clinometer column compass construction contours convenient correct determine difference of level direction distance distant points diurnal motion drawing drawn edge feet forward angle 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 mile military Nautical Almanac needle object observed offsets pacing parallax parallel perpendicular picket plane table pole pole star position protractor represented resection right angles right ascension road ruler scale of horizontal screw sextant shade shown side sidereal sketch spirit level star station sun's survey surveyor taken telescope theodolite tion traverse line triangle true north upper usually vernier vertical interval yards zenith zero line
Passatges populars
Pàgina 144 - 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.
Pàgina 235 - RANGE-FINDER. DEPRESSION. For Elevated Batteries. Land Service. With Appendices. I., Observations on the Choice of Positions. II., Information to be supplied and Preliminary Work to be carried out by Royal Engineers. 8vo., 14 pp. Illustrated. Wrapper. Price 6rf. Do. NOLAN. MARK I. : Land Service, Handbook for. 1882. Price 1«. Do. WATKIN. Regulations for the Instruction in, and Practice with. 1882. Price 1».
Pàgina 235 - Regulations respecting examinations for admission to the royal military academy and for first appointments therefrom to the royal regiment of artillery and the corps of royal engineers. 16 pp. London, Army Orders, April, 1889. The same.
Pàgina 170 - ... surface. The boards were often covered with gravel, sand, or loam to protect them from wear. Corduroy, or log, roads are make-shifts employed in timbered districts to carry a road over soft, swampy ground always kept moist by springs and which cannot be drained without too much expense. They are built by felling a sufficient number of young trees, as straight and as uniform as possible, and laying them side by side across Corduroy th(; road &t rignt angics to its lcngth.
Pàgina 133 - The process is perfectly simple, and it will not be difficult to repeat it oftener if the height of the hill requires it. This process will give what is called the apparent level, which however is not the true level. Two stations are on the same true level when they are equally distant from the centre of the earth. The apparent level gives the objects...