Description
Single large transparent plate filled with iron-rod plotting compasses
and cochlear detail for auditory teaching
covering metals
this concave glass mirror at 100mm focal length runs at f/1 for vivid real-image demos and converging-reflection work
supplying a duplicate-value option for paired-bench experiments on capacitor energy storage
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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