Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Heavy 150 x 25 x

Heavy 150 x 25 x 15mm Alnico U-shape with clearly marked poles and a keeper bar

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

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

5-inch height including hook for spring-scale suspension

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Heavy 150 x 25 xConvex 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.