Henry Kater's telescope Robert Benoist Plate 14 figure 2 from

Plate 14 figure 2 from the paper 'Sketches and descriptions of three simple instruments for drawing architecture and machinery in perspective'

View of No 7 Angel Court

alis pentapetalis

showing the inside of a theatre and the reactions of different parts of the audience to the play

Henry Kater's telescope Robert Benoist Plate 14 figure 2 fromTelescope 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