1930s White Bakelite Rototherm Thermometer 

1930s White Bakelite Rototherm Thermometer. 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, British 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 working order. The white bakelite is shiny with no chips, cracks or restoration. The face, underneath the glass, is slightly pitted with age.

The plinth is marked GODFREY.

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.