Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Included_Rod & Base & Clamps the smallest in the Alnico

the smallest in the Alnico horseshoe series and well sized for individual student handling during basic attraction-and-repulsion lessons

demonstrating Bernoulli's principle quantitatively

Used to bridge a 4mm-socket instrument to a bare-component test point on the bench

and a 3mm thickness

six steel wires carrying 20 beads each for hands-on instruction in counting

Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Included_Rod & Base & Clamps the smallest in the AlnicoRange rated 50mm double concave glass lens spanning 300 1000mm focal lengths, ground polished edges and optically worked surfaces giving long bench divergence flexibility in refraction work.