of Cambridge and Muswell Hill, London
1920 Jan. Physical and Optical Societies Exhibition. Exhibitor of electrical instruments.
1920 September. Exhibited at the Machine Tool and Engineering Exhibition at Olympia with CO2 recorders
1922 The 'Collins Micro-Indicator for High Speed Engines' was patented in 1922 by W. G. Collins, director of the Cambridge & Paul Instrument Co. A very small piston moved a stylus to engrave diagrams on a small celluloid disc. An solenoid acted to press the stylus against the disc. The diagrams were only about 3mm long, with a maximum height of about 2.5mm, so a magnified image was projected onto a screen using a projector in a readily portable case. .
1924 Change of name to Cambridge Instrument Co when it became a public limited company status.