The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful [sic] Practice of this Art, with a New Set of Accurate Mathematical Tables |
From inside the book
Results 1-5 of 23
Page 47
... horizon . Hence , the triangle AEC has its exterior angle ECD and one of its interior angles CAE respectively double of the ex- terior angle BCD and the interior angle CAB of the triangle * For an excellent demonstration of this theorem ...
... horizon . Hence , the triangle AEC has its exterior angle ECD and one of its interior angles CAE respectively double of the ex- terior angle BCD and the interior angle CAB of the triangle * For an excellent demonstration of this theorem ...
Page 48
... horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its most improved state , and ...
... horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its most improved state , and ...
Page 112
... horizon : thus , if Ad , ef , gh , & c . were trees on the side of a hill , they grow per- pendicular to the horizontal base AC , and not to the surface AB : hence the base will be capable to contain as many trees as are on the surface ...
... horizon : thus , if Ad , ef , gh , & c . were trees on the side of a hill , they grow per- pendicular to the horizontal base AC , and not to the surface AB : hence the base will be capable to contain as many trees as are on the surface ...
Page 121
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid in a brass rim , to pre- vent the needle being disturbed by wind or rain at the time of surveying there is also a brass ...
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid in a brass rim , to pre- vent the needle being disturbed by wind or rain at the time of surveying there is also a brass ...
Page 122
... horizon- tal direction , with the sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book in the sec- ond column opposite to ...
... horizon- tal direction , with the sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book in the sec- ond column opposite to ...
Other editions - View all
Common terms and phrases
ABCD acres altitude Answer arch base bearing centre chains and links ciphers circle circumferentor column compasses contained cube root decimal decimal fraction diagonal difference of latitude divided divisions divisor draw east ecliptic edge EXAMPLE feet field-book figure four-pole chains fraction given number half the sum height Hence horizon glass hypothenuse inches instrument latitude and departure length logarithm manner measure meridian distance method multiplied needle nonius number of degrees object observed opposite parallelogram perches perpendicular plane prob proportional protractor quadrant quotient radius rhombus right angles right line rule scale of equal screw secant sect sector semicircle side square root station subtract suppose survey taken tance Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence whole number
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.