Closed Retort Ring with Stem, 5.9" ID, Plated Mild Steel Item Type_Cell Model 8mm rod attachment and a

8mm rod attachment and a centered 50mm aperture together hold a lens square against an optical-bench rail for repeatable refraction

Pairs with the Malvern turbine/pump unit through two basins and shaped glass tubes on a stand

winding weights for electrical-to-potential-energy work

Wider 70 x 20 x 8mm cross-section on this Alnico bar pair gives a broader pole face than typical bar magnets

Closed Retort Ring with Stem, 5.9" ID, Plated Mild Steel Item Type_Cell Model 8mm rod attachment and aPlated 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.