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Ordnance Trigonometrical Survey of Great Britain and 
YfT Ireland. Account of the observations and calculations, of the principal 

AI-triangulation; and of the figure, dimensions and mean specific 
gravity of the earth as derived therefrom, Published by order of 
the Master-General and Board of Ordnance. Drawn up by Captain 
Alexander Ross CI a r k e. R. E. F. R. A. S. under the direction 
of Lt. Colonel H. Ja me s, R. E. F. R. S. M. R. I. A. etc. 
Superintendent of the Ordnance Survey. (p. XVII und 781.) (1 Bd. 
Text 4. mit 28 Plänen.) (2 Bde.) 4. London 1868.