Description
Single large transparent plate filled with iron-rod plotting compasses
driving performance with motor-generator #2
Used to draw electrons from glass and ebonite rods during rubbing
sized to read one step up from the 0-1A meter when student circuits draw past the lower meter's full-scale deflection
covering metals
Opisometer Geology Single large transparent plate filledOpisometer 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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