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 protracter , 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 protracter , 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 difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given angle given number half the sum Horizon glass hypothenuse inches instrument latitude length logarithm measure meridian distance minutes multiplied 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 side sights square root station stationary distance subtracted survey taken tance Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 52 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 39 - The Circumference of every circle is supposed to be divided into 360 equal parts, called Degrees ; and each degree into 60 Minutes, each minute into 60 Seconds, and so on.
Σελίδα 18 - DISTINGUISH the given number into periods of two figures each, by putting a point over the place of units, another over the place of hundreds, and so on, which points shew the number of figures the root will consist of. 2. " FIND the greatest square number in the first, or left hand period...
Σελίδα 120 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Σελίδα 31 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Σελίδα 87 - On the line of lines make the lateral distance 10, a transverse distance between 8 on one leg, and 6 on the other leg. On the line of sines make the lateral distance 90, a transverse distance from 45 to 45 ; or from 40 to 50 ; or from 30 to 60 ; or from the sine of any degree to their complement.
Σελίδα 7 - RULE. Divide as in whole numbers, and from the right hand of the quotient point off as many places for decimals as the decimal places in the dividend exceed those in the divisor.
Σελίδα 82 - ... longer than the intermediate adjacent ones, these are whole degrees ; the shorter ones, or those of the third order, are 30 minutes. From the centre, to 60 degrees, the line of sines is divided like the line of tangents ; from 60 to 70, it is divided only to every degree ; from 70 to 80, to every two degrees ; from 80 to 90, the division must be estimated by the eye.