Double Extra Dense Flint Glass Prism, 1.25", R=1.71-1.74 Prong_3 attached to a 10mm diameter

attached to a 10mm diameter 5

with side arms bent at right angles and formed into jets at their tips

this insulated wire keeps polarity color-coded across short branches in 4mm-socket student circuits

Hand-cranked friction-wheel drive sandwiched between clear acrylic plates

sized to span single-cell up through stacked-battery voltages on a single classroom instrument

Double Extra Dense Flint Glass Prism, 1.25", R=1.71-1.74 Prong_3 attached to a 10mm diameterDouble extra dense flint glass prism at 1. 25 inch sides with refractive index between 1. 71 and 1. 74, the heaviest leaded flint giving the strongest dispersion in the comparison kit.