The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 29
... true to 8 , or 9 places ; and therefore it will be very easy to exa- mine any suspected Logarithm in the Tables . For the arrangement of Logarithms in a Table , the method of finding the Logarithm of any natural number , and of finding ...
... true to 8 , or 9 places ; and therefore it will be very easy to exa- mine any suspected Logarithm in the Tables . For the arrangement of Logarithms in a Table , the method of finding the Logarithm of any natural number , and of finding ...
Page 98
... true , except the two first or two last terms of the pro- portion are on the line of tangents , and neither of them under 45 ° ; in this case the extent on the tangents is to be made in a contrary direction : For had the tangents above ...
... true , except the two first or two last terms of the pro- portion are on the line of tangents , and neither of them under 45 ° ; in this case the extent on the tangents is to be made in a contrary direction : For had the tangents above ...
Page 149
... true , let the measure of the angle CHD be taken by the line oo , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Note , That in ...
... true , let the measure of the angle CHD be taken by the line oo , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Note , That in ...
Page 167
... true ; if not , turn the table about , the index lying on the last line , till through the sights you see the object in the first station and then screw it fast , and keeping the edge of the index to the second station , direct your ...
... true ; if not , turn the table about , the index lying on the last line , till through the sights you see the object in the first station and then screw it fast , and keeping the edge of the index to the second station , direct your ...
Page 227
... true place of the extended line . Lay then the fiducial edge of the scale from 6 to D , and take a distance from C , that will just touch the edge of the scale ; carry that distance along the edge , till the point which was in C , cuts ...
... true place of the extended line . Lay then the fiducial edge of the scale from 6 to D , and take a distance from C , that will just touch the edge of the scale ; carry that distance along the edge , till the point which was in C , cuts ...
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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.