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Italian made
Excellent condition
the gold leaf will stray further away from the stationary rod
Square lenses are a magnifier that can be removed by unhooking from frame
The first widely used radio receiver
Leslie's Differential Thermometer radio Italian madePristine 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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