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 Surveys ...J. Wiley & sons, 1902 - 357 Seiten |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
according to Sec adjustment altitude amount angle apparent sun applied artificial horizon assume average end-areas azimuth barometer calculated centre centre-heights centre-line chord chronometer correct cosec Cosin Sine Cosin cost Cotang Tang Cotang course cross-section cubic yards curvature difference in elevation distance engineer equal Equation error Exsec feet following table frog given in Sec gives grade Greenwich hour hour-angle inches Index-reading instrument latitude length locate longitude measured mercury meridian meridian altitude method mile miles per hour Nautical Almanac observed obtained offset ordinary parallax parallel plot plumb-bobs Polaris position prime vertical prismoidal formula R₁ radius rails refraction screws sections sextant side sidereal Sine Cosin Sine slope-stakes slopes star station subchord suppose surface taken taking Tang Cotang Tang tangent telescope temperature tion track transition curves triangle usually velocity vernal equinox vernier vers vertical weight
Beliebte Passagen
Seite 235 - A soft tough iron, if broken gradually, gives long silky fibres of leaden-gray hue, which twist together and cohere before breaking. A medium even grain with fibres denotes good iron. Badly refined iron gives a short blackish fibre on fracture. A very fine grain denotes hard steely iron, likely to be coldshort and hard. Coarse grain with bright crystallized fracture or discolored spots denotes cold-short, brittle iron, which works easily when heated and welds well.
Seite 247 - ... slide until the distant object first sighted upon is brought into distinct vision. If the vertical wire strikes the same line as at first, the slide is correct for both near and remote objects ; and, being itself straight, for all distances. But if there be an error, proceed as follows : first, with the thumb and forefinger twist off the thin brass tube that covers the screws CC shown in the sectional view of the telescope, p.
Seite 7 - The Theory of the Compound Transition Curve reduced to Practical Formulae and Rules for Application in Field Work, with complete tables of Deflections and Ordinates for five hundred Spirals. By Wm. H. Searles, CE, author of "Field Engineering,
Seite 235 - Good steel in its soft state has a curved fracture and a uniform gn-y lustre ; in its hard state a dull, silvery, uniform white. Cracks, threads, or sparkling particles denote bad quality. Good steel will not bear a white heat without falling to pieces, and will crumble under the hammer at a bright red heat, while at a middling heat it may be drawn out under the hammer to a fine point.
Seite 8 - 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 SURVEYS. By HCGodwin.
Seite 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...
Seite 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...
Seite 243 - We infer from this that a triangle can be constructed with three given lines as sides, when the sum of any two sides is greater than the third side.
Seite 233 - The most suitable season for felling timber is that 'in which vegetation. is at rest, which is the case in midwinter or midsummer. Recent experiments incline to give the preference to the latter season — say the month of July; but the usual practice is to fell trees for timber between the first of December and the middle of March.
Seite 235 - 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.