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 38
... angle , as ABC . Note , When an angle is expressed by three letters , the middle one is that at the angular point . 9. When the lines that form the angle are right ones , it is then called a right - lined angle , as ABC , fig . 4. If ...
... angle , as ABC . Note , When an angle is expressed by three letters , the middle one is that at the angular point . 9. When the lines that form the angle are right ones , it is then called a right - lined angle , as ABC , fig . 4. If ...
Página 40
... angle HCB is an angle of 60 degrees . Hence angles are greater or less according as the arc described about the angular point , and terminated by the two sides , contains a greater or less number of degrees of the whole circle . 29. The ...
... angle HCB is an angle of 60 degrees . Hence angles are greater or less according as the arc described about the angular point , and terminated by the two sides , contains a greater or less number of degrees of the whole circle . 29. The ...
Página 41
... angles , it is either right - angled , having one right angle , as D. fig . 13 . 37. Or obtuse angled , having one obtuse angle , as E. fig . 14 . 38. Or acute angled , having all the angles acute , as F. fig . 15 . 39. Acute and obtuse ...
... angles , it is either right - angled , having one right angle , as D. fig . 13 . 37. Or obtuse angled , having one obtuse angle , as E. fig . 14 . 38. Or acute angled , having all the angles acute , as F. fig . 15 . 39. Acute and obtuse ...
Página 43
... angles are equal to one another . 8. If two right lines not parallel , be produced towards their nearest distance ... angle . 2. But if the line fall slantwise , as EB , and let AB be perpendi- cular to CD ; then the DBA = DBE + EBA ...
... angles are equal to one another . 8. If two right lines not parallel , be produced towards their nearest distance ... angle . 2. But if the line fall slantwise , as EB , and let AB be perpendi- cular to CD ; then the DBA = DBE + EBA ...
Página 44
... angles made by those lines will be equal to each other : that is , AEB to CED , and BEC to AED . By theorem 1. BEC + ... angle will be equal to the internal and opposite one on the same side , that is , GEB EFD and AEG - CFE . 4. And the ...
... angles made by those lines will be equal to each other : that is , AEB to CED , and BEC to AED . By theorem 1. BEC + ... angle will be equal to the internal and opposite one on the same side , that is , GEB EFD and AEG - CFE . 4. And the ...
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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