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

Higher-range 50V multiplier for galvanometer conversion

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

46mm copper wire on a 9mm soft-iron U-form core

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 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.