The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 4
... beneath the other points . EXAMPLES . Add 4.7832 3.2543 7.8251 6.03 2.857 and 3.251 together . Place them thus , 4.7832 3.2543 7.8251 6.03 2.857 3.251 Sum - 28.0006 . Add 6.2 121.306 .75 27 and 0007 to gether . DECIMAL FRACTIONS .
... beneath the other points . EXAMPLES . Add 4.7832 3.2543 7.8251 6.03 2.857 and 3.251 together . Place them thus , 4.7832 3.2543 7.8251 6.03 2.857 3.251 Sum - 28.0006 . Add 6.2 121.306 .75 27 and 0007 to gether . DECIMAL FRACTIONS .
Page 5
... exactly under the other two points . EXAMPLES . From 38.765 take 25.3741 25.3741 Difference - 13.3909 . From 2.4 take .8472 .8472 Diff . - 1.5528 From 71.45 take 8.4837248 . Difference 62.9662752 . From 84 DECIMAL FRACTIONS . 5.
... exactly under the other two points . EXAMPLES . From 38.765 take 25.3741 25.3741 Difference - 13.3909 . From 2.4 take .8472 .8472 Diff . - 1.5528 From 71.45 take 8.4837248 . Difference 62.9662752 . From 84 DECIMAL FRACTIONS . 5.
Page 6
... from whence it arose . EXAMPLES . Multiply 48.765 by .003609 .003609 438885 292590 146995 Product.175992885 Multiply .121 by .14 484 121 Product - .01694 Multiply 121.6 by 2.76 2.76 7296 8512 2432 Product - 6 DECIMAL FRACTIONS .
... from whence it arose . EXAMPLES . Multiply 48.765 by .003609 .003609 438885 292590 146995 Product.175992885 Multiply .121 by .14 484 121 Product - .01694 Multiply 121.6 by 2.76 2.76 7296 8512 2432 Product - 6 DECIMAL FRACTIONS .
Page 7
... , annex ciphers to this remainder , and continue the operation till nothing remains , or till a sufficient number of decimals shall be found in the quotient , EXAMPLES . Divide .144 by .12 .12 ) .144 ( DECIMAL FRACTIONS . 7.
... , annex ciphers to this remainder , and continue the operation till nothing remains , or till a sufficient number of decimals shall be found in the quotient , EXAMPLES . Divide .144 by .12 .12 ) .144 ( DECIMAL FRACTIONS . 7.
Page 8
Containing All the Instructions Requisite for the Skilful Practice of this Art Robert Gibson. EXAMPLES . Divide .144 by .12 .12 ) .144 ( 1.2 - quotient . 12 24 . 24 0 Divide 63.72413456922 by 2718 2718 ) 63.72413456922 ( .02344522979 ...
Containing All the Instructions Requisite for the Skilful Practice of this Art Robert Gibson. EXAMPLES . Divide .144 by .12 .12 ) .144 ( 1.2 - quotient . 12 24 . 24 0 Divide 63.72413456922 by 2718 2718 ) 63.72413456922 ( .02344522979 ...
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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.