Description
Relay-based NAND-gate module on a demonstration base
this concave glass mirror at 100mm focal length runs at f/1 for vivid real-image demos and converging-reflection work
Single large transparent plate filled with iron-rod plotting compasses
and cochlear detail for auditory teaching
Used to draw electrons from glass and ebonite rods during rubbing
Opisometer Geology Relay-based NAND-gate module on aOpisometer with a knurled wheel on a threaded spindle, rolling along curved lines on maps, charts, and drawings to convert winding distance into straight line length for geography coursework.
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