Air-Cooled Rheostat, Model C Glass Bottles_Reagent Bottles this 20mm-diameter steel helix carries

this 20mm-diameter steel helix carries longitudinal

Large-scale typical flower model with removable floral parts and a bisected ovary showing internal ovule arrangement for detailed botany instruction

illustrating linear thermal expansion

Twin drivers rated 5W and 8W share a 28 x 10 x 10cm wooden enclosure with independent coaxial-to-4mm connections

Air-Cooled Rheostat, Model C Glass Bottles_Reagent Bottles this 20mm-diameter steel helix carriesAir cooled rheostat with extended tube ventilation, dissipating heat across the slide bar carriage during sustained high current circuit work in physics laboratory demonstrations.