Ultimate Wave Form Helix with Wooden Stand, 20cm Closed Height Type_Dual End Simple-form wheel and axle with

Simple-form wheel and axle with a larger wheel on a smaller axle

letting students route current down either branch of a circuit by choosing which slot the plug occupies

supplied with a jockey and heavy-duty 4mm socket terminals for null-deflection EMF work

Stable-resistance 22 SWG bare constantan wire on a 125g reel

and 40 metal masses matched to ±1%

Ultimate Wave Form Helix with Wooden Stand, 20cm Closed Height Type_Dual End Simple-form wheel and axle withMounted on a wooden display stand at 20cm closed height, this large helix produces transverse, longitudinal, standing wave, and interference patterns directly observable to a full classroom.