| Charles A. Long - 1861 - 228 pages
...connected with the polisher by strings hooked to it in six places, each two-thirds of the radius from the centre. At M there is a swivel and hook, to which a rope is attached, connecting the disc with a lever and counterpoise weight, so adjusted as to sustain the whole weight of the polisher,... | |
| John F. W. Herschel - Telescopes - 1861 - 208 pages
...connected with the polisher by strings hooked to it in six places, each two-thirds of the radius from the centre. At M there is a swivel and hook, to which a rope is attached, connecting the disc with a lever and counterpoise weight, so adjusted as to ' sustain the whole weight of the polisher,... | |
| Cyclopaedia - 1852 - 264 pages
...the polisher by strings hooked to it in 6 places, each two-thirds of the radins from the centre. At D is a swivel and hook, to which a rope is attached connecting the whole with the lever L, so that the polisher presses upon the speculum with a foree equal to the difference between its... | |
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