The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtJ.J. Harper, 1828 - 435 páginas |
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Página 5
... Altitude of the Sun. Section the fourth shows how to find the Variation of the Compass , with a description of the Azimuth Compass , and its use . In this edition is introduced a new set of accurate Mathematical Tables . Truth calls ...
... Altitude of the Sun. Section the fourth shows how to find the Variation of the Compass , with a description of the Azimuth Compass , and its use . In this edition is introduced a new set of accurate Mathematical Tables . Truth calls ...
Página 7
... Altitude of the Sun 243 4. Variation of theCom- pass - LIST OF TABLES . 133 Logarithms of Numbers - 143 Sines , Tangents , and Secants Natural Sines · 150 Points of the Compass - 177 Traverse Table - Me- - 187 Of computing the Area of a ...
... Altitude of the Sun 243 4. Variation of theCom- pass - LIST OF TABLES . 133 Logarithms of Numbers - 143 Sines , Tangents , and Secants Natural Sines · 150 Points of the Compass - 177 Traverse Table - Me- - 187 Of computing the Area of a ...
Página 45
... altitude of the sun above the horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its ...
... altitude of the sun above the horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its ...
Página 52
... 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 ...
Página 127
... altitude required . 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 the ...
... altitude required . 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 the ...
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Términos y frases comunes
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