Directions for making the best composition for the metals of reflecting telescopes: and the method of casting, grinding, polishing, and giving them the true parabolic figure / [John Edwards].
- Edwards, John, Rev., B.A.
- Date:
- [1787]
Licence: Public Domain Mark
Credit: Directions for making the best composition for the metals of reflecting telescopes: and the method of casting, grinding, polishing, and giving them the true parabolic figure / [John Edwards]. Source: Wellcome Collection.
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