Concave Glass Mirror, 75mm Diameter, 300mm Focal Length Item Type_Density Cubes & Cylinders Copper plate with 4mm socket

Copper plate with 4mm socket terminals for the simple-cell apparatus

Four-socket E10 lamp holder pre-wired in series on a hard-plastic base with two 4mm banana terminals

Larger-aperture 75mm lens at a 15cm focal length captures more of a specimen at a glance

88-inch face reading 0-2

Polished copper calorimeter at 75 by 50mm with a lidded wood-and-plastic cover

Concave Glass Mirror, 75mm Diameter, 300mm Focal Length Item Type_Density Cubes & Cylinders Copper plate with 4mm socketConcave glass mirror, 75mm diameter and 300mm focal length, ~3mm thick, the f 4 curvature stretching the focal throw for projection style image formation and reflector telescope analogues.