This unusual barometer exibits all the charactaristics of similar work by Daniel Quare 1649-1724 and John Patrick 1668-1720, vide N. Goodison, English Barometers and their Makers 1680-1860, London, 1969, pp. 178-183 & 186-201. Charles Cabrier, Clockmakers' Company 1697-1724, was a particularly fine watch and clockmaker, his clocks exibited many features similar to to those by Daniel Quare indicating that he may well have worked closely with Quare whose output was considerably larger than Cabrier's. This collaboration between clockmakers was fairly common, there is even conclusive evidence to show that Quare made use of Tompion's services presumably when Quare's workshop was too busy. The incorporation of the watch was probably a special order and has to be wound every day which may have been the reason for its very limited output