Jonathan Sisson (about 1690–1749) was a mathematical instrument maker in
London who made several large instruments for astronomical observatories across
Europe, and who received a Royal Appointment to the Prince of Wales in 1729. He
trained and was succeeded by his son, Jeremiah Sisson (1720–1783). Instrument
by both men are signed "J. Sisson, London."
Ref: Gloria Clifton, Directory of British Scientific Instrument Makers
1550–1851 (London, 1995), p. 253.