Thermograph – Ex Australian Antarctic Division | Voyager Rare Books Maps & Prints

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Thermograph – Ex Australian Antarctic Division

Short Description

A vintage instrument and an essential piece of Antarctic equipment something to measure and record the temperature over time.

This is the weekly “Bureau of Meteorology" CBM metal cased design with clockwork drum – which ticks away quite pleasantly.

We say ex Australian Antarctic because there is a big sticker on the back saying it was disposed - we will leave it for others to remove.

Weighs a bit so a postage supplement may be required - enquire and we will do our best ....

The principle used is that a coiled bi-metallic strip [steel and copper] is attached to a long light lever or arm that holds a tiny pen. Small movements in the bi-metallic strip cause much larger movements at the end of the arm making the pen rise and fall with changes in temperature – these changes being recorded on the chart which is clockwork driven and turns once every week – in this case. A simple but effective analogue process.

Thermograph from the Australian Antarctic Division which has no doubt been safely digitised and using poisonous batteries rather than eco friendly hand cranked clocks.

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