File:19th century knowledge optics lens grinding machine.jpg

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19th_century_knowledge_optics_lens_grinding_machine.jpg (520 × 370 pixels, file size: 29 KB, MIME type: image/jpeg)

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English: 19th century knowledge optics lens grinding machine
Date
Source The engineer's and mechanic's encyclopaedia, comprehending practical ...
Author Luke Hebert

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current03:07, 8 December 2009Thumbnail for version as of 03:07, 8 December 2009520 × 370 (29 KB)Jonp154 (talk | contribs){{Information |Description={{en|1=19th century knowledge optics lens grinding machine}} |Source=The engineer's and mechanic's encyclopaedia, comprehending practical ... |Author=Luke Hebert |Date=1836 |Permission= |other_versions= }}

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