Description
A P.M. Tamson Dasymeter or baroscop to measure the Buoyancy of Air or the weight of air. A small balance supporting a glass bulb and a small weight on two sides of an arm. When placed in a evacuated bell jar the glass bulb appears heavier due to its greater loss of buoyancy.
The balance arises from a black painted steel stand a painted label says it was made by ‘P.M. Tamson instrumenten Den Haag’. This instrument maker was founded in 1878 by mrs. Tamson under her husbands name as a wholesaler in tools and educational equipment in the field of chemistry and physics. Nowadays, Tamson specializes in laboratory equipment. A similar dasymeter is included in the Max Kohl catalogue of 1912 and therefor this dasymeter can be dated about that age.
Dimensions: 9,5 cm x 13,5 cm x 5 cm.
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Dealer information
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.