Gravesande Ring and Ball with Chain, 22mm Ball Subject_Botany Five-centimeter brass sphere mounted on

Five-centimeter brass sphere mounted on an ebonite-insulated metal base

Blue 300mm 2mm-stackable lead with nickel-plated split-hollow pins

Wall-mountable beech wood draining rack measures 20 x 20 inches and holds up to 90 pieces of labware inverted for post-wash drying in chemistry labs

displayed on a wooden block for balance calibration and weighing experiments in the lab

two beaker mugs

Gravesande Ring and Ball with Chain, 22mm Ball Subject_Botany Five-centimeter brass sphere mounted onChain tethered 22mm brass ball paired with a Gravesande ring, sliding freely through the ring when cool but arrested once flame heating expands the ball beyond fit.