Six maximum and minimum thermometer, 19th

Six's maximum and minimum thermometer, 1780.

Six's self-registering thermometer by Cary, 18th century.

Six's self-registering thermometer, 18th century.

Rutherford maximum and minimum thermometer, 1794.

Minimum thermometer,1861-1870.

Minimum thermometer,1861-1870.

Wet bulb thermometer by Thomas Jones, 1816-1850.

Wet bulb thermometer by Thomas Jones, 1816-1850.

Wet bulb thermometer by Thomas Jones, 1816-1850.

Six's mercury-in-glas thermometer, late

Pocket sundial, Chinese, c 1900-1925.