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 125
... station , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance from the observer to the foot of the steeple or the base , 85 feet . Height of the instrument , or of the ob- server , 5 feet ...
... station , which is on an horizontal plane . Given , A STEEPLE . The angle of altitude , 53 degrees . Distance from the observer to the foot of the steeple or the base , 85 feet . Height of the instrument , or of the ob- server , 5 feet ...
Σελίδα 129
... . C B To take the altitude of a perpendicular object , on the top of a hill , at one station ; when the top and bottom of it can be seen from the foot of the hill . As in prob . 1. take an angle to the. 17 OF HEIGHTS . 129 fg. 81. ...
... . C B To take the altitude of a perpendicular object , on the top of a hill , at one station ; when the top and bottom of it can be seen from the foot of the hill . As in prob . 1. take an angle to the. 17 OF HEIGHTS . 129 fg. 81. ...
Σελίδα 131
... stations , thus ; Let DC be a tower which cannot be approached , by means of a moat or ditch , nearer than B ; at B , take an angle of altitude to C ; distance backward to A , measure any convenient which note down at A , take another ...
... stations , thus ; Let DC be a tower which cannot be approached , by means of a moat or ditch , nearer than B ; at B , take an angle of altitude to C ; distance backward to A , measure any convenient which note down at A , take another ...
Σελίδα 134
... stations ; thus , Let the height DC , of a wind - mill on a hill be re- quired . From any part of the plane whence the foot of the object can be seen , let angles be taken to ... station . Second station . Angle to the foot 184 OF HEIGHTS .
... stations ; thus , Let the height DC , of a wind - mill on a hill be re- quired . From any part of the plane whence the foot of the object can be seen , let angles be taken to ... station . Second station . Angle to the foot 184 OF HEIGHTS .
Σελίδα 135
... station . Second station . Angle to the foot DAB 21 ° 00 ' Angle to the top CAB 35 ° 00 ′ Stationary distance AB 104 feet . Angle to the top 48 ° 30 ' DC required . Geometrically . On an indefinite blank line , lay the stationary dis ...
... station . Second station . Angle to the foot DAB 21 ° 00 ' Angle to the top CAB 35 ° 00 ′ Stationary distance AB 104 feet . Angle to the top 48 ° 30 ' DC required . Geometrically . On an indefinite blank line , lay the stationary dis ...
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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