The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 134
... chains and their re- spective links will differ also . The English statute - perch is 53 yards , the two- pole chain is 11 yards , and the four pole one is 22 yards ; hence the length of a link in a statute- chain is 7.92 inches . There ...
... chains and their re- spective links will differ also . The English statute - perch is 53 yards , the two- pole chain is 11 yards , and the four pole one is 22 yards ; hence the length of a link in a statute- chain is 7.92 inches . There ...
Page 135
... pole chain , there is a large ring , or sometimes a round piece of brass 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 ...
... pole chain , there is a large ring , or sometimes a round piece of brass 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 ...
Page 139
... pole , 160 two - pole chains , or 320 perches , make a mile as before : and if roads . are measured by a statute chain , it will give OF THE CHAIN . 139.
... pole , 160 two - pole chains , or 320 perches , make a mile as before : and if roads . are measured by a statute chain , it will give OF THE CHAIN . 139.
Page 140
... pole , and others by a two - pole chain ; and as ground for houses is measured by feet , we , will shew how to re- duce one to the other , in the following problems . PROB . I. To reduce two - pole chains and links to four - pole ones ...
... pole , and others by a two - pole chain ; and as ground for houses is measured by feet , we , will shew how to re- duce one to the other , in the following problems . PROB . I. To reduce two - pole chains and links to four - pole ones ...
Page 141
... pole chains and links , to two - pole ones . Double the chains , to which annex the links , if y be less than 50 ; but if they exceed 50 , dou- the chains , add one to them , and take 50 from links ... two - pole chains OF THE CHAIN . 141.
... pole chains and links , to two - pole ones . Double the chains , to which annex the links , if y be less than 50 ; but if they exceed 50 , dou- the chains , add one to them , and take 50 from links ... two - pole chains OF THE CHAIN . 141.
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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.