A rare early 20th century Negretti & Zamba whirling hygrometer. A hygrometer is an instrument used to measure the amount of water vapour in the are, in soil, or in confined spaces. Enrico Negretti and Joseph Zamba, both born in Italy, began their photographic and scientific instrument company in 1850. With premises initially in Regent Street, the company was extremely successful, winning a medal at the Great Exhibition in 1851 and eventually being appointed optical instrument makers to Prince Albert, the Royal Observatory and the British Admiralty. This particular model comes complete with all the original items and in the original case.
The former owner was Mr Hal Williams who died in February 1943 aged 70. He had been in practice in London for 43 years as a consulting engineer and engineer architect. He was articled to Sir Frederick Bramwell and Graham Harris, consulting engineers, of London, in 1893, and on the completion of his articles in 1897 received his practical training with Messrs Haslam and Company of Derby. At the time of his death he was acting as consultant to the Ministry of Works in connection with the emergency cold stores for the Ministry of Food.
A chance to own a piece of engineering history.
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Depth - 6 cm
Height - 3 cm
Age - Early 20th Century
Origin - English