16.5" Inclined Plane Simple Machine Model Chemistry a battery-free source of partial

a battery-free source of partial vacuum for bell-jar demonstrations without external power

producing audible beats when sounded against its fixed-frequency partner on the matching wooden resonance base

75-inch frame for draining

this plant cell model shows organelle ultrastructure and cell-wall layering for upper-level cell biology teaching

Needle valve and flame stabilizer add precision control to this nickel-plated micro Bunsen burner running on natural gas for small-flame work

16.5" Inclined Plane Simple Machine Model Chemistry a battery-free source of partialSixteen and a half inch wooden inclined plane with a paired cart, demonstrating mechanical advantage as the angle of incline changes the effort needed to roll the cart up the slope.