The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtE. Duyckinck, 1811 - 508 من الصفحات |
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الصفحة 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 instrument . This box ...
... 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 instrument . This box ...
الصفحة 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 ...
الصفحة 177
... level . A protractor , 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 . 177.
... level . A protractor , 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 . 177.
الصفحة 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 ...
الصفحة 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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عبارات ومصطلحات مألوفة
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
مقاطع مشهورة
الصفحة 38 - 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.
الصفحة 25 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
الصفحة 197 - RULE. From half the sum of the three sides subtract each side severally.
الصفحة 106 - 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.
الصفحة 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.