Keywords: Ramsden's zenith telescope.png en The zenith telescope constructed by Jesse Ramsden in 1802 Used to determine the latitude of stations of the Principal Triangulation of Great Britain 1829 An Introduction to Practical Astronomy Volume 2 William Pearson other versions PD-old-70-1923 Uploaded with UploadWizard Surveying Ordnance Survey Jesse Ramsden |