## Surveying and Navigation, with a Preliminary Treatise on Trigonometry and Mensuration |

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adjacent adjusted altitude angle base bearing becomes changes circle co-sine compass corner correction corresponding cosec Cotang course departure difference direction dist distance divided draw east equal established Examples feet field notes formulas function give given height hence horizontal included increases intersection land latitude length less logarithm marked measured meridian method middle miles minus needle negative opposite original parallel passes perpendicular plane positive principles Problem quadrant radius range reading respectively sailing screw section corner ship side sights sine solution square stake station surface survey taken Tang tangent telescope third township trees triangle true turn values variation vernier vertical volume

### Popular passages

Page 110 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts.

Page 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.

Page 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.

Page 22 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.

Page 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.

Page 144 - Any angle is greater than the difference between 180° and the sum of the other two angles.

Page 124 - That is, the sines of the sides of a spherical triangle are proportional to the sines of the opposite angles.

Page 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.

Page 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...

Page 162 - Now, since the areas of similar polygons are to each other as the squares of their homologous sides...