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Thermometer

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Thermometer
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This thermometer is graduated to show the Great Pyramid Temperature Scale. The instrument dates from around 1870 and is unsigned.

This mercury-in-glass thermometer does not, in fact, register the scale shown of 'degrees Pyramid', and was probably devised by Charles Piazzi Smyth from actual measurements taken by him in 1865 on his visit to Egypt. It may have been designed by him on his return as a piece of lecture demonstration apparatus.

The Great Pyramid temperature scale was worked out by Charles Piazzi Smyth. On the scale, the mean temperature of the King's Chamber in the centre of the pyramid was 50 degrees, water froze at 0 degrees, and platinum melted at 5000 degrees - well beyond the range of mercury thermometers.

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