The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 74
... geometry was extended to the different arts , either connected with , or dependent upon it , new instru- ments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to 74 MATHEMATICAL.
... geometry was extended to the different arts , either connected with , or dependent upon it , new instru- ments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to 74 MATHEMATICAL.
Page 81
... equal parts , forming divi- sions of the third order . ' The divisions on all the scales are contained be- tween four parallel lines ; those of the first order M extend to the most distant ; those of the third DRAWING INSTRUMENTS . 81.
... equal parts , forming divi- sions of the third order . ' The divisions on all the scales are contained be- tween four parallel lines ; those of the first order M extend to the most distant ; those of the third DRAWING INSTRUMENTS . 81.
Page 82
Containing All the Instructions Requisite for the Skilful Practice of this Art Robert Gibson. extend to the most distant ; those of the third , to the least ; those of the second to the intermediate parallel . When the whole line of ...
Containing All the Instructions Requisite for the Skilful Practice of this Art Robert Gibson. extend to the most distant ; those of the third , to the least ; those of the second to the intermediate parallel . When the whole line of ...
Page 83
... extend the com- passes from the centre of the sector to 5 on the primary divisions , and open the sector till this dis- tance become the parallel distance from 10 to 10 on the same divisions ; then the parallel distance from 6 to 6 , ...
... extend the com- passes from the centre of the sector to 5 on the primary divisions , and open the sector till this dis- tance become the parallel distance from 10 to 10 on the same divisions ; then the parallel distance from 6 to 6 , ...
Page 84
... extended from the centre , shall reach to the fourth proportional 3 . In the same manner a third proportional is found to two numbers . Thus , to find a third proportion- al to 8 and 4 , the sector remaining as in the former example ...
... extended from the centre , shall reach to the fourth proportional 3 . In the same manner a third proportional is found to two numbers . Thus , to find a third proportion- al to 8 and 4 , the sector remaining as in the former example ...
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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.