Concave Glass Mirror, 75mm Diameter, 300mm Focal Length Item Type_Density Cubes & Cylinders Barlow's Wheel apparatus with neodymium

Barlow's Wheel apparatus with neodymium magnets and a heavy base

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

75-inch analog-to-digital converter samples and quantizes a continuous input into a binary digital output for student visualization

Emission Control Module - Item # AT-5102

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 Barlow's Wheel apparatus with neodymiumConcave 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.