Railroad Engineers' Field-book and Explorers' Guide: Especially Adapted to the Use of Railroad Engineers on Location and Construction, and to the Needs of the Explorer in Making Exploratory SurveysJ. Wiley & sons, 1890 - 358 pages |
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Common terms and phrases
according to Sec adjustment altitude amount angle apparent sun applied artificial horizon assume average end-areas azimuth barometer Base Base Base bubble-tube calculated centre centre-heights chord correct cosec Cosin Sine Cosin cost Cotang Tang Cotang course cross-section cubic yards curvature degree of curvature difference in elevation distance engineer equal Equation error Exsec feet formula given in Sec gives grade horizontal hour-angle inches Index-reading instrument latitude length locate longitude mean measure mercury meridian meridian altitude method miles per hour Nautical Almanac observed obtained offset ordinary Parallax parallel plot plumb-bobs Polaris position prime vertical prismoidal R₁ radius rails refraction resistance screws sextant side sidereal Sine Cosin Sine slopes speed star station subchord suppose surface taken taking Tang Cotang Tang tangent telescope tion track train transition curves triangle tube usually velocity vernal equinox vernier Vers vertical weight
Popular passages
Page 234 - Nitric acid will produce a black spot on steel ; the darker the spot the harder the steel. Iron, on the contrary, remains bright if touched with nitric acid. Good steel in its soft state has a curved fracture and a uniform grey lustre ; in its hard state, a dull, silvery, uniform white.
Page 233 - For the purpose of seasoning, timber should be piled under shelter, where it may be kept dry, but not exposed to a strong current of air ; at the same time, there should be a free circulation of air about the timber, with which view...
Page 232 - ... uniform color. If the top has a regular, rounded form ; if the bark is dull, scabby, and covered with white and red spots, caused by running water or sap, — the tree is unsound. The decay of...
Page 247 - ... out the object-glass, so as to bring the vertical wire upon an object as near as the range of the telescope will allow. Having this clearly in mind, unclamp the limb, turn the instrument half-way around, reverse the...
Page 248 - When both wires in succession have been thus treated, the line of collimation is adjusted on the near object, and the telescope again brought upon the most distant point ; here the tube is again revolved, the reversion of the wires upon the object once more tested, and the correction, if necessary, made in the same manner. He proceeds thus until the wires will reverse upon both objects in succession ; the line of collimation will then be in adjustment at these and all intermediate points, and by...