Keywords: Rees's Cyclopaedia - Hooke's optical telegraph.png Robert Hooke's proposal for an optical telegraph system For further explanatory text see entry on TELEGRAPH volume 35 of the Cyclopædia Rees's Cyclopædia Plates Vol IV TELEGRAPH Fig 1 and 2; from a digital scan at http //archive org/details/cyclopaediaplates04rees Delineator Creator John Farey Jr Engraver Creator Wilson Lowry 1802-1820 serial publication of the source work PD-old-X-1923 100 Retouched picture Cropped adjusted levels removed fig 1 and fig 2 various paper stains and blemishes and digital artifacts grayscaled Morgan Riley http //archive org/stream/cyclopaediaplates04rees page/n325/mode/2up Morgan Riley Robert Hooke Signal towers Images from Rees's Cyclopædia Images by John Farey Jr |