The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 38
... is called a circle ; and the curve line described by the point B , is called the circumference or the periphery of the circle ; the fixed point C , is called its centre . 14. The describing line CB . ( fig . 8. 38 GEOMETRY .
... is called a circle ; and the curve line described by the point B , is called the circumference or the periphery of the circle ; the fixed point C , is called its centre . 14. The describing line CB . ( fig . 8. 38 GEOMETRY .
Page 78
... fixed to a handle , the blades are so bent , that the ends of the steel points meet , and yet leave a suffi- cient cavity for the ink ; the blades may be opened more or less by a screw , and , being properly set , will draw a line of ...
... fixed to a handle , the blades are so bent , that the ends of the steel points meet , and yet leave a suffi- cient cavity for the ink ; the blades may be opened more or less by a screw , and , being properly set , will draw a line of ...
Page 79
... fixed at one end of the upper part of the handle of the drawing pen . It is used to mark the intersection of lines , or to set off divisions from the plotting scale , and protractor . OF THE SECTOR . Amidst the variety of mathematical ...
... fixed at one end of the upper part of the handle of the drawing pen . It is used to mark the intersection of lines , or to set off divisions from the plotting scale , and protractor . OF THE SECTOR . Amidst the variety of mathematical ...
Page 128
... fixed , move the right leg to 71 ° . 40 ; that distance laid from 45 ° on the same line will reach to 23 ° . 30 ' , the half difference of the required angles . Whence the an- gles are obtained , as before . The second proportion may be ...
... fixed , move the right leg to 71 ° . 40 ; that distance laid from 45 ° on the same line will reach to 23 ° . 30 ' , the half difference of the required angles . Whence the an- gles are obtained , as before . The second proportion may be ...
Page 135
... fixed at every 10 links ; and at 50 links , or in the middle , there are two large rings . In such chains as have a brass piece at every 10 links , there is the figure 1 on the first piece , 2 on the second , 3 on the third , & c . to 9 ...
... fixed at every 10 links ; and at 50 links , or in the middle , there are two large rings . In such chains as have a brass piece at every 10 links , there is the figure 1 on the first piece , 2 on the second , 3 on the third , & c . to 9 ...
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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.