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       Author [James, Henry, 1803-1877, Clarke, Alexander Ross, 1828-1914] Full Title (General diagram of the triangulation, showing the connection of different figures in the preceding plates). Plate XVIII. Engraved at the Ord. Map Office, Southampton. (to accompany) (V. 2: plates) Ordnance Trigonometrical Survey. Account of Principal Triangulation. Plates. (with) (V.1: text) Ordnance trigonometrical survey of Great Britain and Ireland : Account of the observations and calculations of the principal triangulation ... London: Printed by George Edward Eyre, and William Spottiswoode. Printers to the Queens most excellent Majesty. 1858. Publisher [George Edward Eyre and William Spottiswoode, Ordnance Survey Map Office] Author [James, Henry, 1803-1877, Clarke, Alexander Ross, 1828-1914] Full Title Principal Triangulation. Plate XIX. (to accompany) (V. 2: plates) Ordnance Trigonometrical Survey. Account of Principal Triangulation. Plates. (with) (V.1: text) Ordnance trigonometrical survey of Great Britain and Ireland : Account of the observations and calculations of the principal triangulation ... London: Printed by George Edward Eyre, and William Spottiswoode. Printers to the Queens most excellent Majesty. 1858. Publisher [George Edward Eyre and William Spottiswoode, Ordnance Survey Map Office] 
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