Account of the Observations and Calculations: Of the Principal Triangulation; and of the Figure, Dimensions and Mean Specific Gravity of the Earth as Derived Therefrom
Results of a survey project carried out between 1783 and 1853 at the instigation of the Director of the Ordnance Survey General William Roy, to accurately measure the dimensions of Great Britain and Ireland, for mapping and for levying land taxes.
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Apparatus Arbury Hill Arthur's Azimuthal Balta Barrow Hill Base Battock Berule Black Blue Hill Botton Brandon South Castle Church Tower circle Collier Law Computations connection Crowborough Crowle Beacon Danbury Church Spire Deadman Depot Diagram distance DUBLIN OBSERVATORY Dudwick Dunkirk Dunnose Dunstable Easington East Epping Cupola Errors Fair Isle Fairlight Beachy Head fathoms 15 fathoms Fell Foula GEOMETRICAL PROJECTION Greenwich Hart Head High Hill G House Hungry ISLANDS Jura Kippure Keeper Knock Knockanattrin Line Little Stirling Lomond Lundy Meridian Minster Mormonth Mount Mowcopt Nevis Nodes Beacon North North End observed OFFICE ORDNANCE SURVEY Plan Point of Projection Pole Port position PRINC PRINCIPAL Fig PRINCIPAL TRIA Fig PRINCIPAL TRIANGULATION PLATE Rock Rona Salisbury Sandstone Saxavord Sayre Seat Sector Stations showing Slieve Donand Slieve Snaght Snowdon South Southampton sphere Trap Walton Tower Week Wingreen Wrotham Zenith مال