This maximum-minimum thermometer, which registers the upper and lower temperatures of the atmosphere between readings, probably helped Tooth’s brewery maintain the correct temperature range for making beer. This type of thermometer, in which the highest and lowest temperatures between readings are indicated by markers moved by the mercury, was invented by James Six around 1780. In 1902 the maker of this one, Giles Zeal of London, patented the mercury-filled compressible glass chamber at the top,...
Thermometer, maximum-minimum, mercury / glass / metal / string, made by Zeal, London, England, date unknown, used by Tooth and Co, Sydney, New South Wales, Australia
A thermometer, made of metal, glass and string, which consists of a rectangular metal case in which sits a metal plate. A U-shaped thermometer is secured on metal plate with small metal band and screws. Engraved onto metal plate is text which reads, 'MIN / 0 / 10 / 20 / 30 / 40 / 50 / 60 / 70 / 80 / 90 / 100 / 110' and to the right 'MAX / 0 / 19 / 20 / 30 / 40 / 50 / 60 / 70 / 80 / 90 / 100 / 110'.