## The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skillful Practice of this Art, with a New Set of Mathematical Tables |

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acres angle Answer arch base bearing called centre chains chord circle column compasses contained contents correction Cosine Cotang decimal degrees departure difference direct distance divided divisions draw drawn east edge equal error EXAMPLE extended feet figure four four-pole fourth fraction give given glass greater ground half height Hence horizon inches land latitude length less logarithm manner marked measure meridian distance method minutes multiplied object observed opposite pair parallel passes perches perpendicular plane PROBLEM proportional quadrant quotient radius reduce remainder right angles right line root rule scale secant side sights sine square station subtract suppose survey taken Tang tangent theo third triangle triangle ABC true whole

### Popular passages

Page 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...

Page 6 - It is, indeed, evident, that the negative characteristic will always be one greater than the number of ciphers between the decimal point and the first significant figure.

Page 49 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.

Page 163 - RULE. From half the sum of the three sides subtract each side severally.

Page 97 - 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 150 - Two ships of war, intending to cannonade a fort, are, by the shallowness of the water, kept so far from it, that they suspect their guns cannot reach it with effect. In order therefore to measure the distance, they separate from each other a quarter of a mile, or 440 yards ; then each ship observes and measures the angle which the other ship and the fort subtends, which angles are 83° 45

Page 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.

Page 31 - Then, because the sum of the logarithms of numbers, gives the logarithm of their product ; and the difference of the logarithms, gives the logarithm of the quotient of the numbers ; from the above two logarithms, and the logarithm of 10, which is 1, we may obtain a great many logarithms, as in the following examples : EXAMPLE 3.

Page 101 - The sine of an angle is equal to the sine of its supplement. The sine rule Consider fig.

Page 149 - At 170 feet distance from the bottom of a tower, the angle of its elevation was found to be 52° 30' : required the altitude of the tower ? Ans.