Surveying and Navigation, with a Preliminary Treatise on Trigonometry and MensurationVan Antwerp, Braggs & Company, 1864 - 490 páginas |
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Página 187
... sight standards are firmly fastened at right angles to the plate by screws , and have slits cut through nearly their whole length , terminated at in- tervals by apertures through which the object toward which the sights are directed can ...
... sight standards are firmly fastened at right angles to the plate by screws , and have slits cut through nearly their whole length , terminated at in- tervals by apertures through which the object toward which the sights are directed can ...
Página 188
... sight standard the one on the right near the bottom , the one on the left near the top - each on a level , when the compass is level , with the zero of its tangent scale . These eye - pieces are centers of arcs tangent to the tangent ...
... sight standard the one on the right near the bottom , the one on the left near the top - each on a level , when the compass is level , with the zero of its tangent scale . These eye - pieces are centers of arcs tangent to the tangent ...
Página 190
... sights . Observe through the slits a fine thread made plumb by a weight . If both sights do not exactly range with the thread , file a little off the under surface of the highest side . 3. To adjust the needle.- Bring the eye nearly in ...
... sights . Observe through the slits a fine thread made plumb by a weight . If both sights do not exactly range with the thread , file a little off the under surface of the highest side . 3. To adjust the needle.- Bring the eye nearly in ...
Página 193
... sights indicate a true meridian . Such a change in the position of the vernier is necessary in subdividing the public lands , after the principal lines have been truly run with the solar compass . - 4. To read the needle to minutes ...
... sights indicate a true meridian . Such a change in the position of the vernier is necessary in subdividing the public lands , after the principal lines have been truly run with the solar compass . - 4. To read the needle to minutes ...
Página 194
... sights . to some well - defined object , as a flag - staff , in the course . Read the bearing from the north end of ... sights are turned toward the west , the north end of the needle . is turned toward the letter W. If the north end of ...
... sights . to some well - defined object , as a flag - staff , in the course . Read the bearing from the north end of ... sights are turned toward the west , the north end of the needle . is turned toward the letter W. If the north end of ...
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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...