Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel sized for general-purpose coil winding

sized for general-purpose coil winding and electromagnet construction at the workhorse gauge of the line

Wooden fulcrum-balance simple-machine model with a sliding pivot

Suspends a 20mm solid brass cube from spring scales for Archimedes'-principle and buoyancy measurement

and internal organelles for detailed protist biology teaching

5-inch height including hook for spring-scale suspension

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel sized for general-purpose coil windingConvex glass mirror at 75mm diameter and 200mm focal length, ~3. 1mm thick, the longer focal value softening divergence and producing a wider apparent field through reduced virtual reflections.