A thermograph by the leading French instrument makers, Richard Freres. This is quite rare because most thermographs by this company had a utility cast iron base with a tin case – this one is has, what appears to be, a mahogany case. The temperature sensor element is housed in a metal mesh cage. The seven day clock drum is working & the temperature range is -10’C to +40’C.

Thermograph By Richard Freres, Paris Circa 1912


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