Air-Cooled Rheostat, Model C Glass Bottles_Reagent Bottles and a second copper) for

and a second copper) for side-by-side comparison of conductivity and resistance

One-inch brass ball that threads onto a pendulum string as a heavier metal counterpart to aluminum or steel balls in mass-dependent periodic-motion investigations

Used as the red-rail partner to the 300mm black 2mm-plug lead

and specific-heat comparisons

illustrating linear thermal expansion

Air-Cooled Rheostat, Model C Glass Bottles_Reagent Bottles and a second copper) forAir cooled rheostat with extended tube ventilation, dissipating heat across the slide bar carriage during sustained high current circuit work in physics laboratory demonstrations.