Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets sized for energy-storage demonstrations where

sized for energy-storage demonstrations where stored joules need to discharge through a visible load

and airway anatomy at scale

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

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

Five-piece giant wooden clothespin set sized at 7

Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets sized for energy-storage demonstrations whereWooden 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.