750mm Red 4mm Insulated Connecting Lead Disposable_Disposable 5 by 4-inch ventilation apparatus

5 by 4-inch ventilation apparatus modeling historic mine-gallery airflow and domestic chimney convection through a candle-driven hot-air-rise demonstration

Push-button engagement on a hand-cranked single-sided cone clutch

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

Compact-format sonometer designed to study the physics of vibrating strings on a footprint smaller than the standard 1-meter teaching unit

Pairs 50mm of aperture with a 200mm focal length on a convex glass surface

750mm Red 4mm Insulated Connecting Lead Disposable_Disposable 5 by 4-inch ventilation apparatusUsed as the red rail partner to the 750mm black 4mm lead, this insulated wire keeps polarity color coded across the mid distance between instruments and student built bench circuits.