A Treatise on Practical Surveying: Which is Demonstrated from Its First Principles, Wherein Every Thing that is Useful and Curious in that Art, is Fully Considered and ExplainedF. Lucas, Jun. and Joseph Cushing, 1816 - 472 páginas |
Dentro del libro
Resultados 1-5 de 31
Página 128
... object whose height is required ; and holding it per- pendicular , so that the plummet may neither swing from it , nor lie on it ; the degree then cut by the hair , or thread , will be the angle of altitude required . If the quadrant be ...
... object whose height is required ; and holding it per- pendicular , so that the plummet may neither swing from it , nor lie on it ; the degree then cut by the hair , or thread , will be the angle of altitude required . If the quadrant be ...
Página 129
... object will be sufficient , as before . PROB . I. fig . 79 . C A B D To find the height of a perpendicular object at one sta- tion , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance ...
... object will be sufficient , as before . PROB . I. fig . 79 . C A B D To find the height of a perpendicular object at one sta- tion , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance ...
Página 130
... object stands ; to which the perpendicular must be continued , and that will be the height of the object . Thus , AB is the base , A the angle of altitude , BC the height of the steeple from the instrument , or from the observer's eye ...
... object stands ; to which the perpendicular must be continued , and that will be the height of the object . Thus , AB is the base , A the angle of altitude , BC the height of the steeple from the instrument , or from the observer's eye ...
Página 131
... object , on an horizontal plane ; by having the length of the shadow given . Provide a rod or staff , whose length is given , let that be set perpendicular , by the help of a quadrant thus ; apply the side of the quadrant , AC , to the ...
... object , on an horizontal plane ; by having the length of the shadow given . Provide a rod or staff , whose length is given , let that be set perpendicular , by the help of a quadrant thus ; apply the side of the quadrant , AC , to the ...
Página 132
... object ; and noting down the angles , mea- sure the distance from the place of observation to the foot of the object . Thus , Given , [ Angle to the foot of the object , 55 ° or 55 ° 15 ' . Angle to the top of it , 31 ° or 31 ° 15 ...
... object ; and noting down the angles , mea- sure the distance from the place of observation to the foot of the object . Thus , Given , [ Angle to the foot of the object , 55 ° or 55 ° 15 ' . Angle to the top of it , 31 ° or 31 ° 15 ...
Otras ediciones - Ver todas
A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Sin vista previa disponible - 2021 |
Términos y frases comunes
20 perches 50 Dist ABCD acres altitude annexed Answer base bearing bisect blank line centre chains and links chord circle circumferentor Co-secant Secant Co-sine Co-tang column contained cyphers decimal decimal fraction Dep Lat difference divided divisor draw east edge EXAMPLE feet field-book figures four-pole chains given angle half the sum height Hence hypothenuse inches instrument latitude length logarithm magnetical measure meridian distance multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM sect semicircle side sights sine square root stationary distance sun's suppose survey taken tance Tang tangent thence theo theodolite THEOREM thro trapezium triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence