Camera lucida drawing aid. Your browser does not support the video tag. Previously: Painter's mahl stick - GIF Constrained ball line drawing aid - photo Electronic touchscreen blackboard - GIF Drawing a perfect circle on a chalkboard - GIF Funny spoof machinist plans - drawing
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mwmkravchenko (Nov 26, 2022), Toolmaker51 (Nov 26, 2022)
Overhead projector in reverse.
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