Gurley Manual of Surveying Instruments ...W. & L. E. Gurley, 1871 |
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Términos y frases comunes
adjusting socket axis Beam Compass Bow Pen Boxwood brass centre cents chain clamp and tangent clamp screw compass circle convex lens declination arc described direction Drawing Pen edge Engineer's Transit Engineers engraving equatorial lines eye-piece feet German Silver glass graduated half degrees inches diameter inches drawn inches long inches shut instru jacob staff lengthening bar lens leveling instrument leveling screws limb line of collimation main socket ment morocco moved needle point object object-glass observation optical axis ordinary Parallel Ruler pen and pencil pencil points pinion plain Dividers plumb-bob position precisely Price Protractor Railroad Compass revolve right angles ring shown side sights slide solar apparatus Solar Compass spindle SPIRIT LEVELS spring steel Strength of Materials sun's image surface Surveying surveyor Surveyor's Transit tangent movement tangent screw telescope Theodolite tion tripod head TROY tube variation Vernier Compass Vernier Transit wyes zero
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Página 168 - P. Report on the Filtration of River Waters for the supply of Cities, as practised in Europe, made to the Board of Water Commissioners of the city of St. Louis.
Página 167 - The THEORY of STRAINS in GIRDERS and similar Structures, with Observations on the application of Theory to Practice, and Tables of the Strength and other Properties of Materials.
Página 81 - Ephemeris of the Nautical Almanac from year to year, is calculated for apparent noon at Greenwich, England. To determine it for any other hour at a place in the United States, reference must be had, not only to the difference of time arising from the longitude, but also to the change of declination from day to day.
Página 166 - KANSAS CITY BRIDGE (THE). With an Account of the Regimen of the Missouri River and a Description of the Methods used for Founding in that River. By O. Chanute, Chief Engineer, and George Morrison, Assistant Engineer.
Página 107 - The telescope has at each end a ring of bell-metal, turned very truly and both of exactly the same diameter; by these it revolves in the wyes, or can be at pleasure clamped in any position when the clips of the wyes are brought down upon the rings, by pushing in the tapering pins.
Página 168 - AN OUTLINE OF THE METHOD OF CONDUCTING A TRIGONOMETRICAL SURVEY. For the Formation of Geographical and Topographical Maps and Plans, Military Reconnaissance, LEVELLING, &c., with Useful Problems, Formulae, and Tables.
Página 75 - ... the image of the sun cannot be brought between the equatorial lines until the polar axis is placed in the plane of the meridian of the place, or in a position parallel to the axis of the earth. The slightest deviation from this position will cause the image to pass above or below the lines, and thus discover the error.
Página 165 - Parks and Pleasure -Grounds : Or Practical Notes on Country Residences, Villas, Public Parks, and Gardens. By CHARLES HJ SMITH, Landscape Gardener and Garden Architect, etc., etc. I2mo. .... $2.00 SMITH. — The Dyer's Instructor : Comprising Practical Instructions in the Art of Dyeing Silk, Cotton, Wool, and Worsted, and Woolen Goods ; containing nearly 800 Receipts.
Página 66 - Box, n, has an arc of about 36° in extent, divided to half degrees, and figured from the centre or zero mark on either side. The needle, which is made as in other instruments, except that the arms are of unequal lengths, is raised or lowered by a lever shown in the cut. The...