Optically Worked Double Concave Glass Lens, 75mm Diameter, 100mm Focal Length Subcategory_Rubber Tubing the high-microfarad decade for slow-RC-charging

the high-microfarad decade for slow-RC-charging and energy-storage demonstrations

Copper-block plug key switch with two 4mm terminals and a removable plastic-guarded plug

Eisco Labs borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C

and instructions for general electronics diagnostics

with a slide-bar carriage carrying a phosphor-bronze contact and three binding posts

Optically Worked Double Concave Glass Lens, 75mm Diameter, 100mm Focal Length Subcategory_Rubber Tubing the high-microfarad decade for slow-RC-chargingDesigned for strong divergence demos, a 75mm aperture double concave glass lens at 100mm focal length spreads light through optically worked surfaces and ground polished edges.