The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 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 ...
Page 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 ...
Page 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.
Page 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 ...
Page 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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Common terms and phrases
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
Popular passages
Page 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.
Page 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.
Page 197 - RULE. From half the sum of the three sides subtract each side severally.
Page 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.
Page 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.