requisite information. For the then with caustic potash. Alcohol was unnecessary. It all the demands made upon it. The telescope was polishing process the mirror was fixed upon a cask, as was washed in pure water and suspended with the sur- built from the designs of the Rev. Father Garais, by shown… … adjustment. Under it was placed the block of glass. Garais, who also designed all the parts and furnished Diagram Illustrating the Method of Grinding the Lens. This block, M, was firmly fixed upon the table, VN, which the wooden models. could be rotated about a vertical axis by the handles, Our…
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