Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Racks & Stands_Test Tube Racks and rolling-motion experiments on inclined

and rolling-motion experiments on inclined planes

and polished — letting an infrared sensor compare emissivity at boiling-water temperature

the high-dispersion material producing exaggerated spectral effects in TIR and refraction work

supplied in five colors at two leads per color so paired wiring stays color-coded across both sides of a circuit

Larger 250 x 46mm solenoid drawing 12V at 6A

Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Racks & Stands_Test Tube Racks and rolling-motion experiments on inclinedOptically worked double convex glass lens at 75mm diameter and 100mm focal length, the f 1. 3 geometry favoring strong convergence and bright real image formation across a wide aperture.