Double Extra Dense Flint Glass Prism, 1.25", R=1.71-1.74 Prong_3 sized to span single-cell up

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

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

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

used to study Snell's law

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

Double Extra Dense Flint Glass Prism, 1.25", R=1.71-1.74 Prong_3 sized to span single-cell upDouble 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.