Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Glassware_Glass Flasks Acrylic semicircular block at 90

Acrylic semicircular block at 90 by 16mm

Marriot-style Boyle's Law apparatus on a 250 by 175mm ABS plastic base with a 50mL gas syringe coupled to a pressure gauge for direct piston-and-gauge P-V data collection

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

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

Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Glassware_Glass Flasks Acrylic semicircular block at 90Range 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.