Vintage Brown Bakelite Rototherm Thermometer

A Vintage Brown Bakelite Rototherm Thermometer, dating to the 1930s. It has a lovely face, with an easy to read dial showing the ‘freezing point’ temperature of 32 ºF, and measures from -20 to 140 ºF.

Made by the British Rototherm Co. Ltd, London, England, Britsh Patent Number 378314: patent dating to 1932.

A ‘must have’ item for the man cave, she den, study or office. It measures temperature in Fahrenheit and is encased in a Bakelite moulding, allowing it to display nicely on an office desk or mantelpiece.

The bimetallic thermometer is in perfect working order.  The brown bakelite is shiny with no chips, cracks or restoration.

Approximate Dimensions:

• Plinth Depth: 7.5cm
• Plinth Length: 10.3cm (4″)
• Height (Plinth and Thermometer): 9cm
• Diameter of thermometer face: 6cm

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Bimetallic Thermometer

Rototherm invented the bimetallic thermometer in 1934. The thermometer has a metal pointer that moves up and down a circular scale. The pointer is mounted on a coiled piece of metal called a bimetallic strip. The hotter the temperature, the more the bimetallic strip expands, and the more it pushes the pointer up the scale.