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Kater-type Hygrometer by Thomas Jones, London, 1811-1814

1811-1814

Azimuth compass, British, 1811-1830

1811-1830

Kater hygrometer, in hinged lidded case

Kater hygrometer,1809, by Thomas Charles Robinson.

1826-1834

Invariable pendulum no. 10 with agate plane no. 10, 1827, by Thomas Jones. In box with telescope, thermometers and accessories

Kater's invariable pendulum, 1827

1827

Kater's convertible pendulum with two adjustable weights, 1817

Kater's convertible pendulum with two adjustable weights

1817