Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Wooden fulcrum-balance simple-machine model with

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

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

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

5-inch height including hook for spring-scale suspension

Carp fish model with removable air bladder

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Wooden fulcrum-balance simple-machine model withConvex 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.