The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 155
... station to station , leaving your ob- ject in the last point you left , till you return to the first station A. * By this method your stations are laid out to the best advantage , and two men may do the business of three , for one of ...
... station to station , leaving your ob- ject in the last point you left , till you return to the first station A. * By this method your stations are laid out to the best advantage , and two men may do the business of three , for one of ...
Page 156
... station , to oversee the chaining , and by this means to walk three times over every line , which is a labour not be borne . Or a back and a fore - sight may be taken at one station , thus ; with the south of the box to your eye ...
... station , to oversee the chaining , and by this means to walk three times over every line , which is a labour not be borne . Or a back and a fore - sight may be taken at one station , thus ; with the south of the box to your eye ...
Page 160
... station to station , still laying the index to 360 , turning it from you , and observing the object at the foregoing station , screwing the instrument fast , and observing the object at the following station , and counting the degrees ...
... station to station , still laying the index to 360 , turning it from you , and observing the object at the foregoing station , screwing the instrument fast , and observing the object at the following station , and counting the degrees ...
Page 161
... stations , abating four right angles , you may conclude that the angles were truly taken , otherwise not . If you take the ... station , and lay the index to 360 ° and 180 ° , with the flower - de - luce of the box next 360 ; unscrew the ...
... stations , abating four right angles , you may conclude that the angles were truly taken , otherwise not . If you take the ... station , and lay the index to 360 ° and 180 ° , with the flower - de - luce of the box next 360 ; unscrew the ...
Page 162
... station ; un- screw it , and set either end of the index to the de- gree of the last line , and turning the whole about with that degree towards you , direct your sights to an object at the foregoing station , and screw the instrument ...
... station ; un- screw it , and set either end of the index to the de- gree of the last line , and turning the whole about with that degree towards you , direct your sights to an object at the foregoing station , and screw the instrument ...
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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.