Thwaites and Reed
of Clerkenwell, London.
Scientific instrument and Clockmakers.
Founded by Aynsworth Thwaites in 1740
The firm has continued in business [1]
The book 'London's Industrial Heritage' by Aubrey Wilson (David & Charles, 1967) features a description and illustration of a gear cutting machine in use in the 1960s, having been made by the company over 100 years earlier.