16.5" Inclined Plane Simple Machine Model Chemistry producing audible beats when sounded

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

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

75-inch frame for draining

Miniature desktop torso with 12 removable parts includes a dissectable head and brain for compact classroom anatomy and biology teaching

16.5" Inclined Plane Simple Machine Model Chemistry producing audible beats when soundedSixteen 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.