Variable Angle Glass Prism, 30° x 30° x 120° Prong_3 supplying the small components needed

supplying the small components needed to extend electromagnetic induction work beyond the standard core and coil pair

used both in galvanic-cell construction and as the photoemitter in classic photoelectric-effect demonstrations

this lamp holder provides connection terminals for fast wiring into series and parallel student-built circuits

Wooden-frame abacus with three U-shaped steel wires carrying 20 plastic beads each on a 13 by 6 inch base

Insulated 2mm-plug lead in the small-scale lead family

Variable Angle Glass Prism, 30° x 30° x 120° Prong_3 supplying the small components neededStandard 30 apex glass prism with 30 x 30 x 120 geometry, the apex angle approaching minimum deviation territory where small apex changes produce visible deviation shifts.