The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page
... Sun Transit of Pole Star ibid 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 PART I. Page . PART II . Page . try CONTENTS .
... Sun Transit of Pole Star ibid 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 PART I. Page . PART II . Page . try CONTENTS .
Page
... Dif . Dist of land Semi - diameter of the Sun Transit of Pole Star ibid 176 263 Difference of Altitude of 7. Method of Dividing Land 8. Maritime Surveying 281 Pole Star and Pole 177 271 Sun's Declination 178 Reduction Table 182.
... Dif . Dist of land Semi - diameter of the Sun Transit of Pole Star ibid 176 263 Difference of Altitude of 7. Method of Dividing Land 8. Maritime Surveying 281 Pole Star and Pole 177 271 Sun's Declination 178 Reduction Table 182.
Page 58
... altitude , have the same proportion between themselves as their bases BA and BD , Let any aliquot part of AB be taken , which will also measure BD : suppose that to be 4g , which will be contained twice in AB , and three times in BD ...
... altitude , have the same proportion between themselves as their bases BA and BD , Let any aliquot part of AB be taken , which will also measure BD : suppose that to be 4g , which will be contained twice in AB , and three times in BD ...
Page 59
... altitudes CG and FH . Let BI be perpendicular to AB and equal to CG , in which let KB = FH , and let AI and AÃ 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 AÃ be drawn . The triangle AIB = ACB ( by cor . to theo . 13. ) and AKB = DEF ; but ( by theo . 18. ) BI : BK :: ABI : ABK ...
Page 168
... using the 180 side , it will serve as a semicircle ; by either of which you may survey in rainy weather , when you cannot have paper on the table . TO MEASURE ANGLES OF ALTITUDE BY THE CIRCUMFE- RENTOR , 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 cannot have paper on the table . TO MEASURE ANGLES OF ALTITUDE BY THE CIRCUMFE- RENTOR , 168 THE PLANE TABLE .
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Common terms and phrases
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Popular passages
Page 38 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Page 25 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Page 197 - RULE. From half the sum of the three sides subtract each side severally.
Page 106 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.