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Pagina 406
application of the refracting telescope to the heav - I was able afterwards to see all the five with a tele- ens , Huygens labored with fresh ardor to execute scope 34 feet long . With these instruments Cas- still more powerful ...
application of the refracting telescope to the heav - I was able afterwards to see all the five with a tele- ens , Huygens labored with fresh ardor to execute scope 34 feet long . With these instruments Cas- still more powerful ...
Pagina 417
The speculum has six feet of clear aperture , and there- case with the ring nebula of Lyra ; indeed , Dr. R. thought it was resolved at its minor axis ; the fainter nebulous matter which fills it is irregularly distributed , having ...
The speculum has six feet of clear aperture , and there- case with the ring nebula of Lyra ; indeed , Dr. R. thought it was resolved at its minor axis ; the fainter nebulous matter which fills it is irregularly distributed , having ...
Pagina 418
The value of fixed tele- the telescope from this plane through a range of scopes , too , kept in dry vaults of uniform tempera- fourteen feet , with a long screw , moved either by ture , into which the rays are to be admitted by hand or ...
The value of fixed tele- the telescope from this plane through a range of scopes , too , kept in dry vaults of uniform tempera- fourteen feet , with a long screw , moved either by ture , into which the rays are to be admitted by hand or ...
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