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 Tables, for the Use of Schools and Colleges |
From inside the book
Results 1-5 of 18
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 near one of the pivots a graduated circle , the plane of which is perpendicular to that axis , and consequently vertical . This circle is graduated so that the index points to zero when the telescope points to the zenith ...
... supporting axis near one of the pivots a graduated circle , the plane of which is perpendicular to that axis , and consequently vertical . This circle is graduated so that the index points to zero when the telescope points to the zenith ...
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 ) . we 2 i + i ( 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 ) . we 2 i + i ( 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
A.M. Hour P.M. altitude azimuth centre circle colatitude collimation column comp cosĀ² cosc Cosecant Cotangent Diff Cotangent Secant course decimal declination departure determined diagram difference of latitude difference of longitude distance divided equal equation error EXAMPLE expressed feet formula Geom given number hence horizontal Hour A.M. Cosine Hour A.M. Hour hour angle hypothenuse instrument Logarithms of Numbers longitude meridian miles multiplied Napier's rules Natural Sines Nautical Almanac negative number of degrees observed obtained parallel parallel sailing perpendicular plane sailing plane triangle Prop proportion quadrant quotient radius right angled triangle right ascension sailed screw second member ship side opposite siderial sin a cos sin a sin sinĀ² sine and cosine solution sphere spherical triangle spherical trigonometry spirit level star subtracting supporting axis TABLE XXVII tangent telescope transit trigonometrical lines vertical zenith