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The telescope is deservedly reckoned one of the most excellent of all the Inventions of the moderns; such noble and useful discoveries have been made by means of this admirable Instrument, and are still to be expected from its further Improvement, that many of the most eminent mathemati­cians have imployed their utmost skill and Industry to bring it to perfection.

VIII. A new method of improving and per­fecting catadioptrical telescopes, by forming the speculums of glass instead of metal

VIII. A new method of improving and perfecting catadioptrical telescopes, by forming the speculums of glass instead of metal