Rumford thermoscope, C 1890

Rumford thermoscope, C 1890

Stock Number: 390227 a

€ 575,-


43 cm high



Country of manufacture


Categories: Scientific, Technology, Physics & Chemistry, Other Technology Antiques


A French differential air thermometer or Rumford thermoscope, circa 1890,
stamped Breton fréres a Paris. With one bulb in line with a radiant heat source, and the other well clear, the expansion of air is indicated by a thread of alcohol in the horizontal tube.
The two glass spheres connected by capillary tube with scales, on turned mahogany stand. 43 cm high.
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NL Van Leest Antiques

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.