Sheet 24 Old Series 1". c1850. Cornwall: Looe, Plymouth, Eddystone Lighthouse. Hand-coloured
Sheet 24 Old Series 1". No date, but very early. Cornwall: Looe Bay, Plymouth, Bolt Head, Eddystone Lighthouse. Hand-coloured engraving, 67 x 99.5cm, dissected, mounted on linen, and folded to 24 x 16.5cm with index map pasted on top outside fold. Topographic date 1809. No legend: absence of geological publication dates and key, indicates an early unrevised engraved plate, the issue blind stamp date is too faint to read. Faint geological survey blind stamp. Sea makes up 65% of map area. Clean, bright colours. In fine condition.
About the England & Wales One Inch Old Series
The Geological Survey of England and Wales used the Old Series of the Ordnance Survey topographic map at a scale of one inch to the mile as its basemap, initially. These engraved basemaps were published and revised between 1805 and 1885; the sheet sizes varied and the layout and numbering system were eccentric. The Old Series geological maps were hand-coloured and without geological sections, which were published separately. The GS of E&W published the Old Series from 1850 to 1900, when it switched to the colour printing and the New Series one inch maps. However, old stock of the Old Series continued to be issued, hand-coloured, until the 1930s.