Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Suspends a 20mm solid brass

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

5-inch height including hook for spring-scale suspension

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

front and rear O2 sensors

Liquid propane Bunsen burner adds a flame stabilizer and adjustable air vent for consistent

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Suspends a 20mm solid brassConvex 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.