4-Step Differential Metal Pulley, 20/30/40/60mm Type_Tall Form sized for high-turn-count windings where

sized for high-turn-count windings where each turn adds little diameter to the coil core

sized to map charge distribution across larger conductors and transfer charge cleanly to an electroscope

this metal helix lets stairwell-scale wave-propagation experiments amplify the visibility of standing waves

and great vessels on a mounted base for cardiology and anatomy teaching

4-Step Differential Metal Pulley, 20/30/40/60mm Type_Tall Form sized for high-turn-count windings whereFour step differential pulley with 20, 30, 40, and 60mm sheaves on a 4 inch mounting rod, letting students compare force ratios across four different radii in a single assembly.