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pattern for grinding optical lenses, aka pattern for grinding optical lenses, grinding, optical, lens, and optics

A diagram detailing how to grind quartz crystals into light-bending optics. Neat!


It tells you how to make a quartz lens with the following components:

1 - quartz crystal
1 - grindwheel

Making this would take good familiarity with craft.
In the upper right corner is a note: 'First discovered by Dr. mechanic.'


It weighs about 100 grams. It is a electromechanical schematic. You have no idea what it might be worth.