2-Prong Vinyl-Coated Burette/Flask/Beaker Clamp with Swivel Boss Head, 4.25" Max Glassware_Glass Burettes drawing both DC and AC

drawing both DC and AC simultaneously with short-circuit protection via a 0

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

Two Alnico cylindrical magnets each 4 inches long and 3/8 inch in diameter

brake pedal switch

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2-Prong Vinyl-Coated Burette/Flask/Beaker Clamp with Swivel Boss Head, 4.25" Max Glassware_Glass Burettes drawing both DC and ACSecures burettes, flasks, and beakers up to 4. 25 inches on a swivel boss head fitting 18mm rods, with screw adjustment tuning pressure to avoid cracking thin wall glass.