Remarks on Engineers' Surveying InstrumentsThe Company, 1888 |
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REMARKS ON ENGINEERS SURVEYING Math Instr Makers Heller &. Brightly Keine Leseprobe verfügbar - 2016 |
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accuracy accurate adjustment axis Beam Compass brass Brightly Centennial chain Civil Engineers clamp Coast Survey Compass cross hairs cross-wires defects diameter distance edition Engineer's Transit error extra feet long field instruments foot Franklin Institute furnished grade graduations Haupt Heller & Brightly horizontal limb horizontal strain improved inches long instru Leveling Instrument leveling screws line of collimation lines from bottom lines from top load long chord magnetic needle Magnetic Variation magnifying ments meridian Messrs method micrometer Mining Engineers MINING TRANSIT minutes of arc Needle Point object glass oblique ordinary Transit paper Philadelphia Plane Table plumb-bob PLUMMET LAMP precisely Prof Protractor Radius Railroad right angles ring side sights Sine slide spherical aberration Stadia Steel Tape Measure surveyor Surveyor's Compass tangent screw Tape Measure Transit Telescope TRAUTWINE tripod head truss tube Tunnel Transit United vernier vertical arc vertical strains weight wire
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Seite 17 - Method of Calculating the Cubic Contents of Excavations and Embankments by the Aid of Diagrams 8vo, 2 00 Webb's Economics of Railroad Construction Large 12mo, 2 50 Railroad Construction 16mo, mor.
Seite 11 - The undersigned, having examined the product herein described, respectfully recommend the same to the United States Centennial Commission for award, for the following reasons, namely: 1.
Seite 42 - The numbers of the ten feet spaces were to be marked by drilling small holes in the tags. I intended to use this for the principal lines of my surveys and to use the chain only for lines which were not of great importance. " When I called upon Mr. Heller (of Heller & Brightly, the instrument makers, of Philadelphia) to order this measure, he suggested that it would be better to use instead of a wire rope, which would stretch, the bands which are manufactured for hoop skirts ; they are made of tempered...
Seite 17 - MORRIS. — Easy Rules for the Measurement of Earthworks : By means of the Prismoidal Formula.
Seite 37 - It has long compound centres ; the horizontal limb is read by two double opposite verniers, placed outside the compass box; the vernier openings in the plate being made very wide, so as to allow the easy reading of the graduations. There is a three inch magnetic needle, and its ring is divided to half degrees.
Seite 15 - To the eye of an observer, this star is continually in motion, and is due north but twice in 23 h. 56 min. ; and is then said to be on the meridian. Now, when it departs from the meridian, it apparently moves east or west, for 5 h.