Circular Perspex Block for Refraction Item Type_Cell Model Cast-iron uprights support a 38cm

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

Manually-operated seismograph model that traces shock waves onto a pulled paper strip

Demonstrates composition and resolution of forces by attaching masses through pulleys on a force board

Chrome-plated 50mm reading magnifier with a 10cm focal length

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

Circular Perspex Block for Refraction Item Type_Cell Model Cast-iron uprights support a 38cmRound 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.