A Treatise on Trigonometry, Plane and Spherical: With Its Application to Navigation and Surveying, Nautical and Practical Astronomy and Geodesy : with Logarithmic, Trigonometrical, and Nautical TablesG.P. Putnam, 1852 - 496 pages |
From inside the book
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Page 148
... axis do not rest immediately upon the piers , but upon flat pieces of brass about 4 inches square , and an inch in ... supporting axis c d . 2. The adjustment of the supporting axis to a horizontal position . 3. The adjustment of the ...
... axis do not rest immediately upon the piers , but upon flat pieces of brass about 4 inches square , and an inch in ... supporting axis c d . 2. The adjustment of the supporting axis to a horizontal position . 3. The adjustment of the ...
Page 149
... axis on which the instrument turns as the object end of the telescope is elevated or depressed . 2. To render the supporting axis horizontal . - This is done by means of a spirit level , of which there are two kinds for the purpose ...
... axis on which the instrument turns as the object end of the telescope is elevated or depressed . 2. To render the supporting axis horizontal . - This is done by means of a spirit level , of which there are two kinds for the purpose ...
Page 150
... supporting axis is made horizontal by placing the level upon it , and turning the screw in the y till the centre of ... supporting axis near one of the pivots a graduated circle , the plane of which is perpendicular to that axis , and ...
... supporting axis is made horizontal by placing the level upon it , and turning the screw in the y till the centre of ... supporting axis near one of the pivots a graduated circle , the plane of which is perpendicular to that axis , and ...
Page 155
... supporting axis ab to a horizontal , and i ' the inclination of the level to ab , i + i ' will denote the inclination of the level to the hori- zon , and we have ( w denoting the west reading and e the east ) . 213 = i + i 2 ( 1 ) ...
... supporting axis ab to a horizontal , and i ' the inclination of the level to ab , i + i ' will denote the inclination of the level to the hori- zon , and we have ( w denoting the west reading and e the east ) . 213 = i + i 2 ( 1 ) ...
Page 156
... supporting axis be the highest instead of the west end , as we have supposed above , a similar course of reasoning ... supporting axis . N. B. If the sum of the east readings exceed the sum of the west readings the east end of the axis ...
... supporting axis be the highest instead of the west end , as we have supposed above , a similar course of reasoning ... supporting axis . N. B. If the sum of the east readings exceed the sum of the west readings the east end of the axis ...
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Common terms and phrases
altitude applied arith azimuth calculated called celestial sphere centre colatitude collimation column comp complement computed corresponding cos² cosc cosec cosine cot² cotangent decimal declination determine diagram diff divided employed equation error EXAMPLE expressed feet formula Geom given number half the sum height hence horizontal hour angle hypothenuse instrument latitude longitude means meridian middle wire miles multiplied Nautical Almanac negative number of degrees observed obtained parallel perpendicular plane triangle polar pole proportion quadrant quotient radius right angled triangle right ascension screw secant second member side opposite siderial sin a sin sin² sine and cosine sine of half solution sphere spherical triangle spherical trigonometry spirit level star substituting subtracting supporting axis supposed tables of Callet tangent telescope three sides transit trigonometrical lines vertex zenith distance