Sheet 34, Old Series 1". 1857. Wiltshire / Gloucester: Calne, Swindon, Marlborough Downs, Cirencester, Stroud.
Sheet 34, Old Series 1". 1857. Wiltshire / Gloucester: Calne, Swindon, Marlborough Downs, Cirencester, Stroud. Topographic date omitted, geological date 1857, issue date 1858. Hand-coloured engraving, 100 x 68cm, flat single folio sheet with clear plate marks, old centre fold, library blind stamps and stencilled sheet no. in lower right corner. Tear along fold from right edge neatly repaired with archival tape. Minor marginal tears along base. Smaller format of the central sheets of old series projection leaves very wide side margins. Clean, bright colours. In very good 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.