Robert Brettell Bate (1782-1847) of London produced hydrometers, saccharometers, and weights and measures for the Board of Excise and Customs, and other departments of the British government. Bate also made, or at least signed his name to, various other mathematical, optical, and philosophical instruments.
Ref: Anita McConnell, R. B. Bate of the Poultry, 1782-1847. The Life and Times of a Scientific Instrument-Maker (London, 1993).
