1930s White Bakelite Square Rototherm Thermometer

1930s White Bakelite Square Rototherm Thermometer. It 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.

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 white Bakelite moulding, allowing it to display nicely on an office desk or mantelpiece, or can be wall hung. 

The bimetallic thermometer is in working order. The white bakelite has no chips, cracks or restoration but has slightly discoloured. The black face, underneath the glass, is surrounded by chrome which has slightly pitted with age.

Approximate Dimensions:

• Width: 8.5cm
• Height: 8.5cm
• Depth: 3.5cm
• Diameter of thermometer face including the chrome surround: 6.5cm

Please click on the following link for more meteorological and weather equipment.

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.