Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |
From inside the book
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Page xi
... screw 80. Manner of obtaining the subdivisions on a circular instrument when a micrometer microscope is used 64 66 858 N ** 1 88 - 64 - 64 - 65 - 66 81. Description of a transit telescope - 82. The fixed wires at the focus of the object ...
... screw 80. Manner of obtaining the subdivisions on a circular instrument when a micrometer microscope is used 64 66 858 N ** 1 88 - 64 - 64 - 65 - 66 81. Description of a transit telescope - 82. The fixed wires at the focus of the object ...
Page 62
... screw car- ries its wires through an extent equal to one of the gradua- tions on the scale ab , and this extent is subdivided by the graduations on the circular heads C and D of the screws . The angular value of each graduation depends ...
... screw car- ries its wires through an extent equal to one of the gradua- tions on the scale ab , and this extent is subdivided by the graduations on the circular heads C and D of the screws . The angular value of each graduation depends ...
Page 63
... screw's revolutions . 77. If the micrometrical apparatus be placed in a frame which is capable of being turned about the optical axis of the telescope , and be provided with a graduated circle , as EF , whose centre is in that axis , so ...
... screw's revolutions . 77. If the micrometrical apparatus be placed in a frame which is capable of being turned about the optical axis of the telescope , and be provided with a graduated circle , as EF , whose centre is in that axis , so ...
Page 64
... screw shall carry the wire over exactly one of the five - minute spaces on the circle ( if the latter be so graduated ) , it is preferred to observe the number of revolutions and the part of a revolution made by the screw while the wire ...
... screw shall carry the wire over exactly one of the five - minute spaces on the circle ( if the latter be so graduated ) , it is preferred to observe the number of revolutions and the part of a revolution made by the screw while the wire ...
Page 65
... screw , of being elevated or depressed for the pur- pose of rendering the axis of motion horizontal ; and the other ... screws which pass through the sides of the telescope , in order that the intersection of the horizontal with ...
... screw , of being elevated or depressed for the pur- pose of rendering the axis of motion horizontal ; and the other ... screws which pass through the sides of the telescope , in order that the intersection of the horizontal with ...
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Common terms and phrases
aberration altitude angular distance apparent ascension and declination astronomical axis azimuth bisected celestial body celestial sphere centre circle colatitude computed considered correction corresponding cotan degrees described determined diameter difference disk earth ecliptic ellipse equal equator equatorial equinoctial point error expressed fixed star formula given Greenwich heliocentric horary horizontal parallax hour angle instant instrument interval latitude latter let fall mean meridian micrometer moon moon's motion movement Nautical Almanac nearly node noon nutation obliquity observed obtained P'PR parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius vector refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter sidereal sidereal clock sine solar sphere spherical triangle star's station subtracted sun's supposed surface tangent telescope transit transit telescope Trigon variation vertical wire zenith distance zero