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
... Meridian Al- tude of the Sun struments 298 305 $ 16 The Circumferentor 152 The Theodolite 4. Variation of the Com- 159 pass 318 The Semicircle 164 Mensuration of An- LIST OF TABLES gles by these In- struments 169 Logarithms of Numbers 1 ...
... Meridian Al- tude of the Sun struments 298 305 $ 16 The Circumferentor 152 The Theodolite 4. Variation of the Com- 159 pass 318 The Semicircle 164 Mensuration of An- LIST OF TABLES gles by these In- struments 169 Logarithms of Numbers 1 ...
Σελίδα 159
... meridian line , or the proper situation of the land . Over the brass circle is a pair of sights , fixed to a moveable index , which turns on the centre of the instrument , and upon which the circumferen- tor - box is placed . This ...
... meridian line , or the proper situation of the land . Over the brass circle is a pair of sights , fixed to a moveable index , which turns on the centre of the instrument , and upon which the circumferen- tor - box is placed . This ...
Σελίδα 163
... meridian ; and inasmuch as one pair is sufficient to find the angles of the field , the se- cond can be of no use : besides , they obstruct the free motion of the moveable index , and therefore are rather an incumbrance than of any real ...
... meridian ; and inasmuch as one pair is sufficient to find the angles of the field , the se- cond can be of no use : besides , they obstruct the free motion of the moveable index , and therefore are rather an incumbrance than of any real ...
Σελίδα 166
... meridian , or flower - de - luce of the box , and there screw it fast . Assign any convenient point , to which apply the edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...
... meridian , or flower - de - luce of the box , and there screw it fast . Assign any convenient point , to which apply the edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...
Σελίδα 167
... meridian line as before , to lay the index on the last drawn line , and look backward through the sights ; if you then see the object in the first station , the table is fixed right , and the needle is true ; if not , turn the table ...
... meridian line as before , to lay the index on the last drawn line , and look backward through the sights ; if you then see the object in the first station , the table is fixed right , and the needle is true ; if not , turn the table ...
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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