Leslie's Differential Thermometer radio Square lenses are a magnifier

Square lenses are a magnifier that can be removed by unhooking from frame

Excellent condition

and dyed bovine leather

Late 19th to early 20th century wooden Chinese Diptych

Plate Marked:  LLOYD'S HYGRODEIK / TYCO'S / ROCHESTER

Leslie's Differential Thermometer radio Square lenses are a magnifierPristine 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