Surveying levels or theodolites designed by Ramsden and Troughton.

- Image ID: E607MX
Surveying levels or theodolites designed by Ramsden and Troughton.
Florilegius / Alamy Stock Photo
Image ID: E607MX
Surveying levels or theodolites designed by Mr. Jesse Ramsden and Mr. Edward Troughton. Copperplate engraving by W. Lowry after an Illustration by J. Farey from Abraham Rees' Cyclopedia or Universal Dictionary, London, 1817.