 | John Mason Good - 1819 - 742 pages
...observer being placed ia a seat C, suspended at the end of it, with his back towards the object he views. There is no small speculum, but the magnifiers...the telescope, near the place of the eye-glass, a speaking pipe runs down to the bottom of the tube, where it goes into a turning joint; and after several... | |
 | Charles Frederick Partington - Science - 1828 - 468 pages
...tube, it is inclined, so as to throw the image upwards, through an aperture for that purpose, to no, runs down to the bottom of the tube, where it goes into a turning joint, thence into a drawing tube, and out of this into another turning joint, from whence it proceeds by... | |
 | 1834 - 438 pages
...the observer being placed in a seat suspended at the end of it, wilh his hack towards the object he views. There is no small speculum; but the magnifiers...down to the bottom of the tube, where it goes into a turning-joint ; and after several other indexions, it at length divides into two brandies, one going... | |
 | 1841 - 488 pages
...the observer being placed in a seat, suspended at the end of it, with his back towards the object he views. There is no small speculum, but the magnifiers...the opening of the telescope, near the place of the eye glass, a speaking-pipe runs down to the bottom of the tube, where it goes into a turningjoint ;... | |
 | Thomas Squire - Astronomy - 1836 - 332 pages
...voice into this pipe, whilst his eye is at the glass. This pipe is one inch and a half in diameter, runs down to the bottom of the tube, where it goes into a turning joint, thence into a drawing tube, and out of this into another turning joint, from whence it proceeds, by... | |
 | Thomas Dick - Astronomical instruments - 1845 - 644 pages
...direct his voice into this pipe, while his eye is at the glass. This pipe, which is H inch in diameter runs down to the bottom of the tube, where it goes into a turning joint, thence into a drawing tube, and out of this into another turning joint, from whence it proceeds, by... | |
 | Thomas Dick - Educational sociology - 1850 - 586 pages
...into this pipe, while his eye is at the glass. This pipe, which is li inch in diameter, runs down К the bottom of the tube, where it goes into a turning joint, thence into a drawing tube, and out of this into another turning joint, from whence it proceeds, by... | |
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... the object he views. There is no small speculum, but the magnifiers are applied immediately to the first focal image. From the opening of the telescope, near the place of the eye glass, a speaking-pipe runs down to the bottom of the tube, where it... 
