Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets Built on a leveled cast-iron

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

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

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

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

Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets Built on a leveled cast-ironWooden 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.