River in Action Geology Teaching Model Subcategory_Prepared Slides Simple-form wheel and axle with

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

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

providing roughly 15 henries of inductance for AC experiments on phase

supplying both current types to a single workstation for circuits and electromagnetism

5 inch Alnico bar pair with steel keepers

River in Action Geology Teaching Model Subcategory_Prepared Slides Simple-form wheel and axle withHand painted river development model tracking how a watercourse shapes terrain from headwaters through meanders to delta, with each stage labeled on a wall mountable backboard.