Closed Retort Ring with Stem, 5.9" ID, Plated Mild Steel Material_Bristle designed to receive real images

designed to receive real images projected by lenses and concave mirrors during focal-length and magnification experiments on the optical bench

closing to a stored length of 6

and a six-turn thick coil for hands-on Lenz's law and induction-heating work

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

shipped with ticker tape

Closed Retort Ring with Stem, 5.9" ID, Plated Mild Steel Material_Bristle designed to receive real imagesPlated mild steel closed retort ring with a 5. 9 inch inner diameter and 5. 5 inch stem, sized for large flasks and funnels held over heat sources in chemistry setups.