Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length prop65 and packaged as a single

and packaged as a single optics kit

supplying the standard short-reach patch wire for student-built 4mm-socket circuits at the bench

Twelve-position rotary capacitance substitution box selecting one capacitor at a time

a classic apparatus for vector-addition and equilibrium experiments where students balance forces applied at varying angles

Used to draw electrons from glass and ebonite rods during rubbing

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length prop65 and packaged as a singleConvex glass mirror at 75mm diameter and 200mm focal length, ~3. 1mm thick, the longer focal value softening divergence and producing a wider apparent field through reduced virtual reflections.