Henry Kater's telescope Size:Standard: 6 x 4in showing the area between the

showing the area between the end of the Strand and St Paul's Cathedral

Illustrations showing microscopic views of the Shepherd

In the possession of John Conduit Esqr

they failed to hatch as they had been left at one point whilst she went off to shed her skin

Royal Exchange

Henry Kater's telescope Size:Standard: 6 x 4in showing the area between theTelescope used by Henry Kater for pendulum observations. Geodesist and metrologist Henry Kater (1777 1835) invented Kater's pendulum in 1817 which enabled the strength of gravity to be determined. This sight was used to view the pendulum during observations in order to avoid parallax error. ca. 1820