Round Convex Glass Mirror, 75mm Diameter, 300mm Focal Length Subcategory_Weights and Masses Open-frame demo motor with two

Open-frame demo motor with two opposing coils on a spinning axle and 4mm banana inputs

Compares liquid-expansion rates by suspending five removable glass bulbs-and-tubes in a shared heated water trough

supporting both additive and subtractive color demonstrations in optical box setups

Five color-coded ceramic ring magnets at 46mm diameter mount on a 15cm wooden dowel

Wide-range triple-scale moving-coil DC voltmeter at 0-3V

Round Convex Glass Mirror, 75mm Diameter, 300mm Focal Length Subcategory_Weights and Masses Open-frame demo motor with twoLong focal 75mm convex glass mirror at 300mm focal length and ~1. 2mm thickness, the gentlest divergence in the 75mm convex line for the largest virtual reduced images.