This is an extremely rare disc barograph of exceptional quality. The mechanism consists of two large sturdy diaphragms linked to the recording arm which draws a trace of the current barometric pressure on to a paper disc chart. The movement is fitted into an imposing ebonized case complete with thick bevelled edged glass to the top and sides. Circa 1900, this instrument is of museum quality. 

Rare and Stunning Disc Barograph


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