Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets Virtually friction-free 2-meter air track

Virtually friction-free 2-meter air track shipped with vehicles

demonstrating mechanical advantage as the angle of incline changes the effort needed to roll the cart up the slope

3V 2A AC filament line for cathode-ray experiments

Built on a leveled cast-iron base with a dual-angle polymer top

this handle-fitted bicycle wheel lets students feel torque resistance in a spinning mass

Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets Virtually friction-free 2-meter air trackWooden frame abacus on a 13. 5 by 9. 5 inch finished base, six steel wires carrying 20 beads each for hands on instruction in counting, place value, and basic arithmetic.