Double Concave Glass Lens, 50mm Diameter, 250mm Focal Length, 3mm Thick Racks & Stands_Flask Stands Compares radiant-heat absorption through paired

Compares radiant-heat absorption through paired surfaces and a white screen

drawing 4-6V DC through 4mm sockets to demonstrate how current produces a concentrated magnetic field

5 inches producing 50-60 dots per second via a vibrating striker

Mid-length 750mm red insulated lead with a 4mm banana plug at one end and a crocodile clip at the other

5A standard rheostat with oxidized constantan winding on a vitreous-enameled steel tube

Double Concave Glass Lens, 50mm Diameter, 250mm Focal Length, 3mm Thick Racks & Stands_Flask Stands Compares radiant-heat absorption through pairedSlim 3mm thick double concave glass lens at 50mm diameter and 250mm focal length, the diverging curvature paired with low mass for ray box mounts and lightweight optics setups.