Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Entomology & Zoology_Zoology Charts & Models the workhorse high-impedance unit for

the workhorse high-impedance unit for low-current voltage-divider and signal-conditioning work

this polypropylene graduated cylinder set is Class B-tolerant

5-inch stainless steel connecting rod

25mm enameled copper wire on a 355 x 50mm air-cored former with 4mm safety sockets and a 6A maximum

sliding freely through the ring when cool but arrested once flame heating expands the ball beyond fit

Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Entomology & Zoology_Zoology Charts & Models the workhorse high-impedance unit forOptically 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.