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 Cushing & Jewett, J. Robinson printer, 1822 - 326 σελίδες |
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Σελίδα 124
... object whose height is required ; and holding it perpendicular , 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 fixed ...
... object whose height is required ; and holding it perpendicular , 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 fixed ...
Σελίδα 125
... object will be sufficient as before . PROB . 1 . fig . 79 . A B D To find the height of a perpendicular object at one station , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance from the ...
... object will be sufficient as before . PROB . 1 . fig . 79 . A B D To find the height of a perpendicular object at one station , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance from the ...
Σελίδα 126
... 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 ...
Σελίδα 127
... object , on an horizontal plane ; by having the length of the shadow given . Provide a rod or staff , whose length ... object , whose height is required ; and you have the proper requisites given . Thus , ab , the length of the shadow of ...
... object , on an horizontal plane ; by having the length of the shadow given . Provide a rod or staff , whose length ... object , whose height is required ; and you have the proper requisites given . Thus , ab , the length of the shadow of ...
Σελίδα 128
... object ; and noting down the angles , measure 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 , measure 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 ...
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A Treatise of Practical Surveying: Which is Demonstrated From Its First ... Robert Gibson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2021 |
Συχνά εμφανιζόμενοι όροι και φράσεις
20 perches ABCD acres altitude Answer base bearing blank line centre chains and links chord circle circumferentor Co-secant co-sine Co-tang column compass contained cyphers decimal decimal fraction difference Dist 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 measure meridian distance multiplied needle number of degrees object off-sets opposite parallel parallelogram perpendicular piece of ground plane polygon Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM secant second station sect semicircle side sights sine square root stationary distance stationary line sun's suppose survey taken tang tangent thence theo theodolite THEOREM thro triangle ABC trigonometry true amplitude true azimuth two-pole chains vane variation whence