Surveying and Navigation, with a Preliminary Treatise on Trigonometry and MensurationVan Antwerp, Braggs & Company, 1864 - 490 páginas |
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Página 194
... east . If the north end of the needle point exactly to either letter E or W , the sights will range east or west . In general , to guard against error , let the surveyor turn the letter S toward himself , and read the arc cut off by the ...
... east . If the north end of the needle point exactly to either letter E or W , the sights will range east or west . In general , to guard against error , let the surveyor turn the letter S toward himself , and read the arc cut off by the ...
Página 209
... , as it will be sufficiently accurate . In practice , surveyors in states just east of the Mis- sissippi allow a difference of 6 hours for longitude ; S. N. 18 . 7 hours for about the longitude of Santa Fé ; INSTRUMENTS . 209.
... , as it will be sufficiently accurate . In practice , surveyors in states just east of the Mis- sissippi allow a difference of 6 hours for longitude ; S. N. 18 . 7 hours for about the longitude of Santa Fé ; INSTRUMENTS . 209.
Página 210
... eastern portions of the United States . Having found the hour at any place from its longi- tude when it is noon at Greenwich , the declination for noon at Greenwich will be the declination for the determined hour at the given place . To ...
... eastern portions of the United States . Having found the hour at any place from its longi- tude when it is noon at Greenwich , the declination for noon at Greenwich will be the declination for the determined hour at the given place . To ...
Página 212
... east and west line , the verniers of the horizontal limb are set at 90 ° , and the sun's im- age kept between the equatorial lines . The needle is made to indicate zero on the arc of the compass box by turning the tangent screw . Lines ...
... east and west line , the verniers of the horizontal limb are set at 90 ° , and the sun's im- age kept between the equatorial lines . The needle is made to indicate zero on the arc of the compass box by turning the tangent screw . Lines ...
Página 213
... east and west lines , the sights are set at 90 ° on the limb , and the line run at right angles to the meridian ; but this line , if sufficiently produced , would cross the equator . Hence , at the next station , a backsight is taken ...
... east and west lines , the sights are set at 90 ° on the limb , and the line run at right angles to the meridian ; but this line , if sufficiently produced , would cross the equator . Hence , at the next station , a backsight is taken ...
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Términos y frases comunes
a. c. log ABCD adjacent angles adjacent sides altitude angle is equal arc increases base line C₁ chains clamp co-sine compass cosec Cotang denote departure diameter difference of level divided east escribed circles Examples feet field notes Find the angle find the area formulas frustum given side height hence horizontal hypotenuse included angle increases from 90 instrument intersection latitude links dist logarithm longitude M.
M. Cosine M.
M. Sine mantissa meander miles minus needle negative number corresponding offsets opposite angle parallel sailing parallelogram perpendicular plane plane sailing positive quarter section corner radius rhumb line right angle sailing secant ship side adjacent sin A sin solar compass spherical triangle stake standard parallel station survey surveyor Tang tangent telescope trapezoid variation vernier versed-sine vertex vertical Willamette Meridian
Pasajes populares
Página 110 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts.
Página 34 - If two triangles have two angles and the included side of the one, equal to two angles and the included side of the other, each to each, the two triangles will be equal.
Página 258 - All the corners marked in the surveys, returned by the surveyor general, or by the surveyor of the lands south of the state of Tennessee, respectively, shall be established as the proper corners of sections, or subdivisions of sections, which they were intended to designate ; and the corners of half and quarter sections, not marked on said surveys, shall be placed as nearly as possible equidistant from those two corners which stand on the same line.
Página 22 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 19 - To Divide One Number by Another, Subtract the logarithm of the divisor from the logarithm of the dividend, and obtain the antilogarithm of the difference.
Página 144 - Any angle is greater than the difference between 180° and the sum of the other two angles.
Página 124 - That is, the sines of the sides of a spherical triangle are proportional to the sines of the opposite angles.
Página 65 - 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.
Página 145 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
Página 162 - Now, since the areas of similar polygons are to each other as the squares of their homologous sides...