The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 39
... arch ( that is , any part of the circum- ference of a circle ) to the other ; and is the measure of the arc . Thus the right line HG , is the mea- sure of the arc HBG , fig . 8 . 18. The segment of a circle is any part there- of , which ...
... arch ( that is , any part of the circum- ference of a circle ) to the other ; and is the measure of the arc . Thus the right line HG , is the mea- sure of the arc HBG , fig . 8 . 18. The segment of a circle is any part there- of , which ...
Σελίδα 77
... arches and circles . If the arch or circle is to be described obscurely , the steel points are best adapted to the purpose ; if it is to be in ink or black lead , either the draw- ing pen , or crayon points are to be used . To use a ...
... arches and circles . If the arch or circle is to be described obscurely , the steel points are best adapted to the purpose ; if it is to be in ink or black lead , either the draw- ing pen , or crayon points are to be used . To use a ...
Σελίδα 78
... arches or circles , which they do much more conve- niently than large compasses , not only on account of their size , but also from the shape of the head , which rolls with great ease between the fingers . Of the drawing pen and ...
... arches or circles , which they do much more conve- niently than large compasses , not only on account of their size , but also from the shape of the head , which rolls with great ease between the fingers . Of the drawing pen and ...
Σελίδα 79
... arch or circle is to be described , of more than an inch radius , the point should be so bent , that the blades of the pen may be nearly perpen- dicular to the paper , and both of them touch it at the same time . The protracting pin ...
... arch or circle is to be described , of more than an inch radius , the point should be so bent , that the blades of the pen may be nearly perpen- dicular to the paper , and both of them touch it at the same time . The protracting pin ...
Σελίδα 80
... arches they describe . Sectors are made of different sizes , but their length is usually denominated from the length of the legs when the sector is shut . Thus a sector of six inches , when the legs are close together , forms a rule of ...
... arches they describe . Sectors are made of different sizes , but their length is usually denominated from the length of the legs when the sector is shut . Thus a sector of six inches , when the legs are close together , forms a rule of ...
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acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat Dep difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied Natural Co-sines natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle Sextant side sights square root station stationary distance subtracted survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction