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
... of the Sun ibid . 6. Changing the scale of Maps Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and Pole 177 Land 271 Sun's Declination 178 8. Maritime Surveying 281 Reduction Table 182 CONTENTS .
... of the Sun ibid . 6. Changing the scale of Maps Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and Pole 177 Land 271 Sun's Declination 178 8. Maritime Surveying 281 Reduction Table 182 CONTENTS .
Σελίδα 58
... altitude , have the same proportion be- tween themselves as their bases BA and BD . 1 Let any aliquot part of AB be taken , which will also measure BD : suppose that to be Ag , which will be contained twice in AB , and three times in BD ...
... altitude , have the same proportion be- tween themselves as their bases BA and BD . 1 Let any aliquot part of AB be taken , which will also measure BD : suppose that to be Ag , which will be contained twice in AB , and three times in BD ...
Σελίδα 59
... altitudes CG and FH . Let BI be perpendicular to AB and equal to CG , in which let KB = FH , and let AI and AK be drawn . The triangle AIB = ACB ( by cor . to theo . 13. ) and AKB = DEF ; but ( by theo , 18. ) BI : BK :: ABI : ABK ...
... altitudes CG and FH . Let BI be perpendicular to AB and equal to CG , in which let KB = FH , and let AI and AK be drawn . The triangle AIB = ACB ( by cor . to theo . 13. ) and AKB = DEF ; but ( by theo , 18. ) BI : BK :: ABI : ABK ...
Σελίδα 168
... , using the 180 side , it will serve as a semicircle ; by either of which you may survey in rainy weather , when you can- not have paper on the table . TO MEASURE ANGLES OF ALTITUDE BY THE CIR- CUMFERENTOR , 168 THE PLANE TABLE .
... , using the 180 side , it will serve as a semicircle ; by either of which you may survey in rainy weather , when you can- not have paper on the table . TO MEASURE ANGLES OF ALTITUDE BY THE CIR- CUMFERENTOR , 168 THE PLANE TABLE .
Σελίδα 169
... altitude re- quired . 2. If an angle of altitude is to be taken by the theodolite , or semicircle , let a thread be run through a hole at the centre , and a plummet be suspended by it ; turn the instrument on one side , by the help of ...
... altitude re- quired . 2. If an angle of altitude is to be taken by the theodolite , or semicircle , let a thread be run through a hole at the centre , and a plummet be suspended by it ; turn the instrument on one side , by the help 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