Google “etching on photographs” and you’ll find a number of different processes; photo chemical etching, photo engraving, even good old lithography. What you won’t find is any reference to hand ...
If you were building a recreation of the James Watt micrometer, where would you start? If you’re [rasp], the answer would be: “Spend a year trying to find the best way to make etched brass discs.” ...
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