The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 152
... glass lid , in a brass rim , to prevent the needle being disturbed by wind or rain , at the time of surveying there is also a brass lid or cover , which is laid over the former to preserve the glass in carrying the in- strument . This ...
... glass lid , in a brass rim , to prevent the needle being disturbed by wind or rain , at the time of surveying there is also a brass lid or cover , which is laid over the former to preserve the glass in carrying the in- strument . This ...
Σελίδα 169
... glass lid be taken off , and let the instrument be turned on one side , with the stem of the ball into the notch of the socket , so that the circle may be perpendicular to the plane of the horizon ; let the instrument be placed in this ...
... glass lid be taken off , and let the instrument be turned on one side , with the stem of the ball into the notch of the socket , so that the circle may be perpendicular to the plane of the horizon ; let the instrument be placed in this ...
Σελίδα 177
... the level A protraeter , with or without a nonius . To be added for county and marine surveying ; An astronomical quadrant , or circular instrument . A a A good refracting and reflecting telescope . A copying glass LIST OF INSTRUMENTS .
... the level A protraeter , with or without a nonius . To be added for county and marine surveying ; An astronomical quadrant , or circular instrument . A a A good refracting and reflecting telescope . A copying glass LIST OF INSTRUMENTS .
Σελίδα 178
... glass . For marine surveying ; A station pointer . An azimuth compass . One or two boat compasses . Besides these , a number of measuring rods , iron pins , or arrows , & c . will be found very convenient , and two or three offset ...
... glass . For marine surveying ; A station pointer . An azimuth compass . One or two boat compasses . Besides these , a number of measuring rods , iron pins , or arrows , & c . will be found very convenient , and two or three offset ...
Σελίδα 284
... glass will measure its drift . And these ought to be noted on the draught , which may be thus : The currents may be shewn , by drawing a dart pointing out its setting , and its drift by the Roman capital letters , the depth of the water ...
... glass will measure its drift . And these ought to be noted on the draught , which may be thus : The currents may be shewn , by drawing a dart pointing out its setting , and its drift by the Roman capital letters , the depth of the water ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat Dep difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied Natural Co-sines natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle Sextant side sights square root station stationary distance subtracted survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction