see Autobiography of Francis Olace, ed. Mary Thale p. 53-4 (in Greyhound Court where Place learned to turn and file) Place made a simple error calling him Cuthbertson. There was indeed a John Cuthbertson, mathematical, philosophical and optical instrument maker c.1743-1821 who worked in Amsterdam in the 1770s and 1780s and then returned to London, trading in Shoe Lane Holborn and then Poland Street. However the mathematical instrument maker in Greyhound Court was David Cuthbert
A David Cuthbert was apprenticed to James Mackay coppersmith of Edinburgh for 6 yrs on 13.8.1768, premium £26. However David Cuthbert was already the ratepayer in Greyhound Court in 1769 so probably not the same person.
Elizabeth dau of David & Elizabeth Cuthbert bapt St Clement Danes 11.8.1776
Charles son of David & Elizabeth Cuthbert bapt St Clement Danes 7.6.1778
SunFire 1785 David Cuthbert mathematical instrument maker, 9, Greyhound Court, Milford Lane
(David Cuthbert = Soho 17.6.2787 Agnes Kay botp banns sigs wits Robert Nicol, Sarah Doyle. May have been him)
David Cuthbert mathematical instrument maker, St Clement Danes took appr William Troup for 7 yrs 12.4.1791 premium £15
David Cuthbert mathematical instrument maker St Clement Danes took appr John Cothbert 27.1.1796 until 21 premium £15
David Cuthbert mathematical instrument maker 9 Greyhound Court, Arundel Street, was witness at Old Bailey 11.5.1796 in trial of Tom Crossfield (the pop-gun plot). Cuthbert knew Upton (the informer) and had called on him to subscribe for the wives and children of the defendants in the 1794 treason trials
Elizabeth Cuthbert bur 23.12.1800 St Martin i t Fields woman from Thackmans Court
John Cuthbert mathematical instrument maker St Pancras took appr John Timson for 7 yrs 27.8.1805 no premium
David Cuthbert widower = St Clement Danes 14.5.1812 Elizabeth Moss widow botp banns sigs wit James Cuthbert
(Davie Cuthbert buried Holborn 1.9. 1820 age 72 from Grays Inn Lane workhouse. May have been him)