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The first widely used radio receiver
allowing the gold leaf to gradually return to its vertical stationary position
Italian made
Late 19th to early 20th century wooden Chinese Diptych
Leslie's Differential Thermometer radio The first widely used radioPristine late 19th century Leslie's Differential Thermometer. Italian made, unsigned. Excellent condition, complete original. Originally invented by John Leslie in the early 1800's; Differential Thermometers are used to measure variations in temperature. This instrument works by adding a working liquid, such as Sulphuric acid to the 'wet bulb' (unnumbered side of U). Once the temperature rises, the pressure in the tube will push the liquid to the 'dry
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