150mm Connecting Lead, Model J Subcategory_Erlenmeyer Flasks sized to fit standard optical-bench

sized to fit standard optical-bench lamp houses and stocked together so a burned-out lamp does not stall an experiment

Mid-sized brass cylinder on an ebonite-insulated base

Hard vulcanized ebonite rod that takes on a strong negative charge when rubbed with fur

sized to mount alongside a tone generator for converting electrical signals into audible tones during sound-wave demonstrations

150mm Connecting Lead, Model J Subcategory_Erlenmeyer Flasks sized to fit standard optical-benchShort 150mm red 2mm stackable lead with nickel plated pins on both ends, sized for compact circuits where stackable plugs branch multiple leads off a single terminal.