The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtJ.J. Harper, 1828 - 435 σελίδες |
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Σελίδα 73
... with 10 , 20 , & c . and proceeding to 180 degrees . The edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a protractor in the form of a parallelogram : the 10 DRAWING INSTRUMENTS . 78.
... with 10 , 20 , & c . and proceeding to 180 degrees . The edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a protractor in the form of a parallelogram : the 10 DRAWING INSTRUMENTS . 78.
Σελίδα 74
... edge , that an angle may be more easily measured , and the divisions set off with greater Application of the protractor to use . 1. A number of degrees being given , to protract , or lay down an angle , whose measure shall be equal ...
... edge , that an angle may be more easily measured , and the divisions set off with greater Application of the protractor to use . 1. A number of degrees being given , to protract , or lay down an angle , whose measure shall be equal ...
Σελίδα 125
... 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 subdivided into halves , or quarters , as the size ...
... 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 subdivided into halves , or quarters , as the size ...
Σελίδα 126
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , 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 index , and lay off the next line ; and proceed through the whole without using the needle , as you do with the theodolite . If ...
Σελίδα 128
... edge of the scale corresponding with that line , the divisions on the edge of the semicircle will run from 0 to 180 , from right to left : again , if it be turned the other way , or downwards , keeping the centre - hole thereof on the ...
... edge of the scale corresponding with that line , the divisions on the edge of the semicircle will run from 0 to 180 , from right to left : again , if it be turned the other way , or downwards , keeping the centre - hole thereof on the ...
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ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal difference of latitude Dist divided divisions divisor draw east Ecliptic edge EXAMPLE feet field-book figure four-pole chains given angle given number half the sum height Hence Horizon glass hypothenuse inches instrument length logarithm measure Meridian Altitude meridian distance method multiplied natural co-sine natural number natural sine Nonius number of degrees object observed off-sets opposite parallel parallelogram perches perpendicular plane prob PROBLEM proportional protractor Quadrant quotient radius rhombus right angles right line Secant sect semicircle Sextant side square root station subtract Sun's survey taken Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence