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Azimuth compass, British, 1811-1830

Azimuth compass, British, 1811-1830

1811-1830
Kater hygrometer, in hinged lidded case

Kater hygrometer, in hinged lidded case

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

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

1811-1814
Kater hygrometer,1809, by Thomas Charles Robinson.

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 three adjustable weights held in a fitted case and transported with a travel crate, 1817.

Kater's convertible pendulum with two adjustable weights

1817
Kater invariable pendulum no. 10, with agate plane by Thomas Jones, Charing Cross, London, 1827. In box with telescope and two mercury thermometers and accessories.

Kater's Invariable Pendulum by Thomas Jones, 1827

1827