Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Glassware_Glass Flasks Comprehensive 15-piece electrostatics set bundling

Comprehensive 15-piece electrostatics set bundling electroscopes

Four 50 gram brass slotted masses paired with a 50 gram hanger

Yellow 150mm 2mm-stackable lead with nickel-plated split-hollow pins

Dark-complexion life-size human torso with 13 removable organs including brain

Acrylic semicircular block at 90 by 16mm

Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Glassware_Glass Flasks Comprehensive 15-piece electrostatics set bundlingRange 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.