The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 50
... laid on the triangle DEF , so as to make the points A and B coincide with D and E , which they will do , because AB DE ( by the hypothesis ) ; and since the angle A = D , the line AC will fall along DF , and inasmuch as they are ...
... laid on the triangle DEF , so as to make the points A and B coincide with D and E , which they will do , because AB DE ( by the hypothesis ) ; and since the angle A = D , the line AC will fall along DF , and inasmuch as they are ...
Page 64
... Lay BL from B to L ; from B with the line BO , describe an arc , and from L with LO describe ano- ther arc ; from O , the interescting ... laid on the other , the sides will mutually agree with each other , and therefore be 64 GEOMETRICAL.
... Lay BL from B to L ; from B with the line BO , describe an arc , and from L with LO describe ano- ther arc ; from O , the interescting ... laid on the other , the sides will mutually agree with each other , and therefore be 64 GEOMETRICAL.
Page 66
... lay off on each side , the equal distances , AC , AD ; and from Cand D , as centres , with any interval greater than AC or AD , describe two arcs intersecting each other in B ; from A to B draw the line AB , and it will be the ...
... lay off on each side , the equal distances , AC , AD ; and from Cand D , as centres , with any interval greater than AC or AD , describe two arcs intersecting each other in B ; from A to B draw the line AB , and it will be the ...
Page 69
... lay again the line A , from C to H ; and through H , draw HI parallel to FG ( by prob . 8. ) so is CI the third ... lay the line A , from E to G ; the line B , from Eto I ; and draw the line IG ; lay the line C , from E to H , and ( by ...
... lay again the line A , from C to H ; and through H , draw HI parallel to FG ( by prob . 8. ) so is CI the third ... lay the line A , from E to G ; the line B , from Eto I ; and draw the line IG ; lay the line C , from E to H , and ( by ...
Page 70
... lay the line A , from A to B , and the line B , from B to C , on the point B , which is the joining point of the lines A and B ; erect a perpendicular BD ( by prob . 5. ) bisect AC in E ( by prob . 4. ) and de- scribe the semicircle 4DC ...
... lay the line A , from A to B , and the line B , from B to C , on the point B , which is the joining point of the lines A and B ; erect a perpendicular BD ( by prob . 5. ) bisect AC in E ( by prob . 4. ) and de- scribe the semicircle 4DC ...
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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.