Metal Refraction and Reflection Apparatus Prong_3 Spring-loaded heavy-gauge steel projectile launcher

Spring-loaded heavy-gauge steel projectile launcher with a string-release trigger

and Snell's law

Wall-mounted Mason's hygrometer with two identical dual-scale thermometers — one dry and one kept wet via a water reservoir — calculating relative humidity from their paired reading difference

illustrating additive color mixing

clamping to bench edges for pulley experiments that need a fixed overhang off the worktop

Metal Refraction and Reflection Apparatus Prong_3 Spring-loaded heavy-gauge steel projectile launcherMetal built apparatus designed for measuring incidence, reflection, and refraction angles when light crosses a boundary between media of different optical density.