Note: Do not rely on this information. It is very old.
RamsdenRamsden, John (1735-1800), a distinguished mathematical instrument maker, was born in Yorkshire. He was at first a humble workman, but turned his attention to the making of optical and other instruments, and married the daughter of Dollond, the famous optician, and carried on a similar business. He improved many instruments and invented others, and was made a F.R.S. He received the Copley Medal in 1795.