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 |
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Página 128
... edge of its arc by looking along its edge AC , to the top of the 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 ...
... edge of its arc by looking along its edge AC , to the top of the 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 ...
Página 129
... edge AC , with small circular holes in them ; which are useful in taking the sun's altitude , requisite to be known in many astronomical cases ; this is effected by letting the sun's ray , which passes thro ' the upper sight , fall upon ...
... edge AC , with small circular holes in them ; which are useful in taking the sun's altitude , requisite to be known in many astronomical cases ; this is effected by letting the sun's ray , which passes thro ' the upper sight , fall upon ...
Página 185
... edge , and is in the middle between the two ends . To this centre hole on the other side of the frame , there are the divisions of a semicircle , or 180 degrees ; and these again are subdivded into halves , or quarters , as the size of ...
... edge , and is in the middle between the two ends . To this centre hole on the other side of the frame , there are the divisions of a semicircle , or 180 degrees ; and these again are subdivded into halves , or quarters , as the size of ...
Página 186
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the in- dex , and lay off the next line ; and proceed through the whole without using the needle , as you do with the theodolite . If ...
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the in- dex , and lay off the next line ; and proceed through the whole without using the needle , as you do with the theodolite . If ...
Página 187
... edge . Move your instrument back to the first station E , and proceed the contrary way to M , and to L ; but in going from thence to K , you again find your sheet will not hold it ; however , draw as much of the line LK on the sheet as ...
... edge . Move your instrument back to the first station E , and proceed the contrary way to M , and to L ; but in going from thence to K , you again find your sheet will not hold it ; however , draw as much of the line LK on the sheet as ...
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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