Circular Perspex Block for Refraction Item Type_Cell Model Single B22 bayonet lamp holder

Single B22 bayonet lamp holder on a hard plastic base with two 4mm banana terminals

delivering wheel-driven power to a lamp or a Newton color disc

Cast-iron uprights support a 38cm expansion bar against a friction-pointer dial reading 0 to 90 degrees

Used to demonstrate parallel-circuit current and brightness behavior

where current through a coil closes a separate contact and shows how a small signal controls a larger circuit

Circular Perspex Block for Refraction Item Type_Cell Model Single B22 bayonet lamp holderRound perspex refraction block, the curved face geometry letting beams enter along any radius for clean Snell's law angle work in ray box and refraction setups.