Invented by American naval officer and inventor, Bradley Allen Fiske, reading machines were used for reading miniaturized texts which were photo-engraved onto cards.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...e_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ng_machine.jpg
Previously:
https://www.homemadetools.net/forum/...062#post125604
https://www.homemadetools.net/forum/...921#post148752
https://www.homemadetools.net/forum/...933#post124846
