Round Convex Glass Mirror, 75mm Diameter, 150mm Focal Length archive-pending and a movable disc plug

and a movable disc plug

Drives gel electrophoresis and other elevated-voltage experiments at 70V DC up to 300mA through a pair of safety sockets

well suited to exciting standing-wave oscillations in a Kundt's tube setup

Compact 2mm-plug connecting lead in the small-scale lead family

this holder keeps light shaping consistent across diffraction

Round Convex Glass Mirror, 75mm Diameter, 150mm Focal Length archive-pending and a movable disc plugPairs a 75mm aperture with a 150mm focal length on a convex glass surface, ~3. 3mm thick, the gentler curvature softening divergence while still producing reduced virtual reflections.