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 74
... geometry was extended to the different arts , either connected with , or dependent upon it , new instru- ments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to 74 MATHEMATICAL.
... geometry was extended to the different arts , either connected with , or dependent upon it , new instru- ments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to 74 MATHEMATICAL.
Σελίδα 77
... extended at pleasure , by pushing the furthermost leg outwards with the middle , or pressing it inwards with the four finger . In describing circles , or arches , set one foot of the compasses on the centre , and then roll the head of ...
... extended at pleasure , by pushing the furthermost leg outwards with the middle , or pressing it inwards with the four finger . In describing circles , or arches , set one foot of the compasses on the centre , and then roll the head of ...
Σελίδα 81
... , forming divisions of the third order . The divisions on all the scales are contained be- tween four parallel lines ; those of the first order M extend to the most distant ; those of the third DRAWING INSTRUMENTS . 81.
... , forming divisions of the third order . The divisions on all the scales are contained be- tween four parallel lines ; those of the first order M extend to the most distant ; those of the third DRAWING INSTRUMENTS . 81.
Σελίδα 82
... extend to the most distant ; those of the third , to the least ; those of the second , to the intermediate parallel . When the whole line of lines represents 100 , the divisions of the first order , or those to which the figures are ...
... extend to the most distant ; those of the third , to the least ; those of the second , to the intermediate parallel . When the whole line of lines represents 100 , the divisions of the first order , or those to which the figures are ...
Σελίδα 83
... extend the com- passes from the centre of the sector to 5 on the primary divisions , and open the sector till this dis- tance become the parallel distance from 10 to 10 on the same divisions ; then the parallel distance from 6 to 6 , ...
... extend the com- passes from the centre of the sector to 5 on the primary divisions , and open the sector till this dis- tance become the parallel distance from 10 to 10 on the same divisions ; then the parallel distance from 6 to 6 , ...
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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