Keywords: RamsdenRS theodolite of 1787.jpg is on true pages 135-160 corresponding to pages 28-53 of the PDF file 1790 Philosophical Transactions of the Royal Society of London volume 80 1790 William Roy Information field See also File RamsdenRS theodolite of 1787 microscope detail png PD-old-100-1923 Uploaded with UploadWizard Theodolites Ordnance Survey Jesse Ramsden |