The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtJ.J. Harper, 1828 - 435 páginas |
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Página 225
... vane , sliding on the station- staff , till the horizontal hair in the glass cuts the middle of that vane : then see how many feet , inches , and parts , are cut by the upper part of the vane , which suppose to be 3 feet 4 inches and 6 ...
... vane , sliding on the station- staff , till the horizontal hair in the glass cuts the middle of that vane : then see how many feet , inches , and parts , are cut by the upper part of the vane , which suppose to be 3 feet 4 inches and 6 ...
Página 226
... vane , till the hair cuts the middle thereof ; and then , if the upper edge of the vane cuts the foregoing sum 6 feet 9 inches , the hair and bubble are truly adjusted . But if not , say , As BD less AD , is to the difference between ...
... vane , till the hair cuts the middle thereof ; and then , if the upper edge of the vane cuts the foregoing sum 6 feet 9 inches , the hair and bubble are truly adjusted . But if not , say , As BD less AD , is to the difference between ...
Página 227
... vane , that the hair in the telescope cuts the middle of the vane , then in a book divided into two columns , the one entitled Back sights , the other Fore sights , enter the feet , inches , and parts cut by the upper edge . of the vane ...
... vane , that the hair in the telescope cuts the middle of the vane , then in a book divided into two columns , the one entitled Back sights , the other Fore sights , enter the feet , inches , and parts cut by the upper edge . of the vane ...
Página 237
... vanes K and L. The Arch , or Limb BC , although only the eighth part of a circle , is on account of the double reflection , divided into 90 degrees , numbered 0 , 10 , 20 , 30 , & c . from the right towards the left ; these are ...
... vanes K and L. The Arch , or Limb BC , although only the eighth part of a circle , is on account of the double reflection , divided into 90 degrees , numbered 0 , 10 , 20 , 30 , & c . from the right towards the left ; these are ...
Página 239
... Vanes K and L are pieces of brass , standing perpen- dicular to the plane of the instrument : the vane K is called the Fore Sight Vane , and L the Back Sight Vane . There are two holes in the Fore Sight Vane , the lower of which and the ...
... Vanes K and L are pieces of brass , standing perpen- dicular to the plane of the instrument : the vane K is called the Fore Sight Vane , and L the Back Sight Vane . There are two holes in the Fore Sight Vane , the lower of which and the ...
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Términos y frases comunes
ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal difference of latitude Dist divided divisions divisor draw east Ecliptic edge EXAMPLE feet field-book figure four-pole chains given angle given number half the sum height Hence Horizon glass hypothenuse inches instrument length logarithm measure Meridian Altitude meridian distance method multiplied natural co-sine natural number natural sine Nonius number of degrees object observed off-sets opposite parallel parallelogram perches perpendicular plane prob PROBLEM proportional protractor Quadrant quotient radius rhombus right angles right line Secant sect semicircle Sextant side square root station subtract Sun's survey taken Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence