Vintage Rototherm Desk Thermometer In A Black Leather Surround

This is a lovely Vintage Rototherm Desk Thermometer In A Black Leather Surround. It has an easy to read dial showing the ‘freezing point’ temperature of 32 ºF / 0 ºC , and measures from -20 to 140 ºF and -30 to 60 ºC.

The Fahrenheit scale is marked in black, and the Centigrade scale in a very pale beige on the outside of the Fahrenheit scale.

Made by The British Rototherm Co. Ltd, London, England.

Approximate Dimensions:

• Maximum Depth: 5.2 cm (2")
• Base Width: 13.4cm 
• Height : 12 cm 
• Diameter of thermometer face: 7.8cm (~3")

A ‘must have’ item for the man cave, she den, study or office, the chrome rototherm is encased in a plain black leather effect 4-sided surround with a plinth allowing it to display nicely on a desk. 

The bimetallic thermometer is in working order. There are no cracks or restoration but there are a few tiny nibbles in the edges of the leather, and a few surface blemishes commensurate with age and use. 

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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.