Sadly, Mason's name is no longer commonly associated with his invention but its continued manufacture into the 1840' and 50's is testament to its superior accuracy. It is now more commonly dubbed, the wet and dry thermometer relating to the comparison of two thermometers, one with a wet bulb and the other dry. This is essentially the same as Mason's pattern where one thermometer is kept wet by means of a water soaked sock covering one bulb and the other kept dry.The evaporation of water from the sock has the effect of lowering the temperature reading on the wet thermometer and the difference against the dry thermometer is used to calculate relative humidity of the air. The maker of this super instrument, Pizzi & Co may not be immediately familiar but it provides a real insight into the Italian émigré community which blossomed in the early nineteenth century and ultimately capitalised on the British obsession with the weather. The premises at 19 Leather Lane was originally owned by Angleo Tagliabue, an adept scientific instrument maker who like most, hailed from the Lake Como region of Northern Italy.
Long forgotten but hugely influential, the Tagliabue family not only apprenticed a young Henry Negretti who would have worked at the premises during his early career but also apprenticed and formed a later partnership with the equally influential Louis Casella. The Tagliabues also went on to form a partnership with Joseph Zambra so it is clear that this family were instrumental in the formation of both Casella and Negretti & Zambra, the two great instrument makers of the Victorian age. In 1841 after the death of her husband Valentino, Jane Pizzi took over the premises at Leather Lane from Angelo Tagliabue and continued her husband's scientific instrument making business.
Between 1841 and 1845, the records suggest that Pizzi continued to employ Henry Negretti who had by this time become an adept glass blower, barometer and thermometer maker, and then shortly after, went into partnership with him until 1845 whereafter Negretti took over the premises as Negretti & Co. Given the evidence, it is likely that this instrument was manufactured in the early 1840's prior to the Pizzi, Negretti partnership (it is signed Pizzi & Co) but at the very least it can be accurately dated to between 1841 and 1845. Given the small size of this enterprise it is not beyond the realms of belief that the instrument may also have been constructed and produced in some part by Henry Negretti himself. Negretti's later career is well documented through his partnership with Joseph Zambra, a relationship which would produce some of the finest meteorological instruments of the era but to find an instrument from his early career where he was actively involved in production is a rare occurrence.
The instrument itself is a rarity but with an equally superb pedigree, it exists as an exemplar of its type and remains in working order. Jason Clarke Antiques are happy to discuss carriage, condition or for any other queries, alternatively, you can also message me and I will endeavour to come back to you as soon as possible. I have a number of beautiful antiques for sale, so please feel free to browse my other items.This item is in the category "Antiques\Science/Medicine\Scientific Instruments". The seller is "jason750_1" and is located in this country: GB. This item can be shipped to United Kingdom.