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

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

plus a removal tool in a 4-compartment storage box

and acrylic in a foam-lined wooden case for density-versus-material investigations

Three-wire setup pairs a 100N spring-balanced string

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.