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active 1876-1901, thermometer & hydrometer maker, Nenhaus am Rennwig, Thüringen, Germany

Haak, William

1836 - 1898
active 1839-1913, optician, mathematical, barometer, thermometer, hydrometer maker, London, British

J. Somalvico and Co.

active 1845-1846, optician, hydrometer, barometer and thermometer maker, London, British

Ronketti, John George Harris

active 1900s?, hydrometer maker,London, England

T Gill

active 1790-1940, hydrometer & mathematical instrument maker, optician, London, England

Dring and Fage

active 1790-1820s, hydrometer makers, London, England

Quin family

active 1921, hydrometer maker, London, England

Blake, Thomas O

active 1792-1839, maker of hydrometers and spirit proofs, Glasgow, Scotland

Twaddell, William