GEISSLER TUBES. WOODEN SHOWCASE WITH 6 DIFFERENT ‘GEISSLER’ TUBES. THE GEISSLER TUBE IS A GLASS TUBE FOR DEMONSTRATING THE PRINCIPLES OF ELECTRICAL GLOW DISCHARGE. PRODUCED BY G. LORENZ. WERKSTATT F�R PR�ZISIONS- MECHANIK, CHEMNITZ.
JOHANN HEINRICH WILHELM GEI�LER (1814-1879) WAS A GERMAN PHYSICIST AND INVENTOR OF THE GEISSLER TUBE, A LOW PRESSURE GAS-DISCHARGE TUBE MADE OF GLASS, WITH AN ELECTRODE AT EACH END. IT CONTAINS ONE OR MORE OF THE FOLLOWING RAREFIED (THINNED) GASSES (NEON, ARGON, AIR); MERCURY OR OTHER CONDUCTIVE LIQUIDS; OR IONIZABLE MINERALS OR METALS, SUCH AS SODIUM. WHEN A HIGH VOLTAGE IS APPLIED TO THE TERMINALS, AN ELECTRICAL CURRENT FLOWS THROUGH THE TUBE. THE CURRENT WILL DISASSOCIATE ELECTRONS FROM THE GAS MOLECULES, CREATING IONS, AND WHEN ELECTRONS RECOMBINE WITH THE IONS, DIFFERENT LIGHTING EFFECTS ARE CREATED. THE LIGHT WILL BE CHARACTERISTIC OF THE MATERIAL CONTAINED WITHIN THE TUBE AND WILL BE COMPOSED OF ONE OR MORE NARROW SPECTRAL LINES.
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Van Leest Antiques
Van Leest Antiques, based in Utrecht in the Netherlands, specialises in antique scientific and medical instruments. Their collection covers mainly scientific and medical antique instruments: barometers, globes and planataria, nautical instruments, anatomical models, and pharmacy items. Toon Van Leest travels regularly in Europe and visits trade fairs, auctions, and antique dealers to collect stock and to find pieces to fulfil his clients' unusual requests.
As well as being an avid antique collector and dealer, Toon Van Leest is also a dentist. He believes that antiques are a stable investment, not reliant on trends or fashion, and have truly lasting value. Above all, he says, antiques are timeless and never lose their beauty.