1930s White Bakelite Rototherm Wall Hanging Thermometer

This 1930s White Bakelite Rototherm Wall Hanging Thermometer has a lovely face, with an easy to read dial showing the ‘freezing point’ temperature of 32 ºF, and measures from 30 to 100 ºF.

It has three white bakelite 'bun' feet which allows the thermometer to also sit neatly on a desk / work surface. One of the feet has a hole in the middle for wall hanging.

The bimetallic thermometer is in working order. The white bakelite has discoloured with age but has no chips, cracks or restoration: there are a few surface blemishes. The face, underneath the glass, is slightly pitted with age. There is no back on the base of the thermometer.

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

Approximate Dimensions:

• Base Diameter:- 11.6cm (~ 4.5")
• Height: 4cm
• 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.