6-Piece Acrylic Lens Set, 50mm (Convex, Concave, Plano, Meniscus) Subcategory_Lab Burners 9A with oxidized constantan winding

9A with oxidized constantan winding on a vitreous-enameled steel tube and a phosphor-bronze sliding contact

supplying steady low-voltage current to electronics and optics circuits on student benches

Brass Magdeburg hemispheres on a mounted base with a stopcock for releasing vacuum

0V max for whole-class hands-on work

and permittivity

6-Piece Acrylic Lens Set, 50mm (Convex, Concave, Plano, Meniscus) Subcategory_Lab Burners 9A with oxidized constantan windingDesigned for safer per desk optics, a 50mm six piece acrylic lens set covers double convex, double concave, plano convex, converging meniscus, diverging meniscus, and plano concave.