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 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
Kater's convertible pendulum with two adjustable weights, 1817 Kater's convertible pendulum with two adjustable weights 1817