W. F. Stanley
William F. Stanley of Great Turnstile, Holborn.
Mathematical, Drawing and Surveying Instruments.
1853 Company established.
William Ford Stanley was an inventor and engineer. He had 78 patents filed in the UK and US.
He designed and made precision drawing and mathematical instruments, surveying instruments and telescopes.
1866 Cycloscope for setting out railway and other curves. 
1885 New Protractor. 
1894 Advert.