Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Entomology & Zoology_Zoology Charts & Models Larger right-angle glass prism at

Larger right-angle glass prism at 2 by 2 by 2

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

5-inch stainless steel connecting rod

Rotation-to-linear gear-rack simple-machine model converting circular gear motion into straight-line rack travel

Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Entomology & Zoology_Zoology Charts & Models Larger right-angle glass prism atOptically 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.