Six's maximum and minimum thermometer, 1780.

Six maximum and minimum thermometer, 19th

Rutherford maximum and minimum thermometer, 1794.

Six's mercury-in-glas thermometer, late

Minimum thermometer,1861-1870.

Minimum thermometer,1861-1870.

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

A natural philosopher studying the height of columns of mercury, 1688.

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

Wet bulb thermometer by Thomas Jones, 1816-1850.

Wet bulb thermometer by Thomas Jones, 1816-1850.

Wet bulb thermometer by Thomas Jones, 1816-1850.