Vintage Chrome & Wood Surround SB Rototherm Thermometer. In The Shape Of A Ships Wheel

Vintage Chrome & Wood Surround SB Rototherm Thermometer. In The Shape Of A Ships Wheel, it dates to about the 1940s. It has a lovely large face, with an easy to read dial showing the ‘freezing point’ temperature of 32 ºF, and measures from -20 to 140 ºF.

Made by Shortland Smiths Instruments (SB).

A ‘must have’ item for the vintage office. It measures temperature in Fahrenheit and is encased in a wood surround with a round wood base, allowing it to display nicely on an office desk or mantelpiece. 

The bimetallic thermometer is in good working order.  The brown wood surround is in pretty good condition with a few scuffs and blemishes commensurate with age and use.

Approximate Dimensions:

• Plinth Diameter: 8cm
• Height: 15.3cm (~6")
• Diameter of thermometer face: 7.9cm (3")
• Diameter of the thermometer including the wood surround: 13.3 cm

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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.