Concave Glass Mirror, 75mm Diameter, 300mm Focal Length Item Type_Density Cubes & Cylinders Larger-aperture 75mm lens at a

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

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

Emission Control Module - Item # AT-5102

at plus-or-minus 10% tolerance for high-impedance work

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

Concave Glass Mirror, 75mm Diameter, 300mm Focal Length Item Type_Density Cubes & Cylinders Larger-aperture 75mm lens at aConcave 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.