254 
SURVEYS. 
Ordnance Survey (continued). 
Begun under the direction of the Royal Society, and continued 
by order of the Honourable Board of Ordnance. From the 
Philosophical Transactions. By Captain William Mudge, 
F.R.S., and Mr. Isaac Dalby. Vol. 1. 4°. London, 1799. 
An Account of the Trigonometrical Survey, carried on by order 
of the Master- General of His Majesty's Ordnance, in the years 
1800, 1801, 1803, 1804, 1805, 1806, 1807, 1808, and 1809. By 
Lieut.-Col. William Mudge and Captain Thomas Colby. 
4°. London, 1811. 
Astronomical Observations made with E-amsden's Zenith Sector, 
together with a Catalogue of the Stars which have been ob- 
served, and the Amplitudes of the Celestial Arcs, deduced from 
the Observations at the different Stations. 4°. London, 1842. 
An Account of the Measurement of the Lough Foyle Base in Ire- 
land, with its Verification and Extension by Triangulation ; 
together with the Various Methods of Computation followed on 
the Ordnance Survey, and the Requisite Tables. By Captain 
William Yolland. 4o. London, 1847. 
Astronomical Observations made with Airy's Zenith Sector, from 
1842 to 1850, for the Determination of the Latitudes of various 
Trigonometrical Stations used in the Ordnance Survey of the 
British Isles. By Captain William Yolland. 4°. London, 1852. 
Meteorological Observations taken during the years 1829 to 1852, 
at the Ordnance Survey Office, Phoenix Park, Dublin : to 
which is added a series of similar Observations made at the 
principal Trigonometrical Stations and at other places in Ire- 
land. By Captain Cameron. 4*^. Dablin, 1856. 
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. Drawn up 
by Captain Alexander Ross Clarke ; made under the direction 
of Lieut.-Col. H. James. [With vol. of Plates.] 
2 vols. 4«. London, 1858. 
Instructions for taking Meteorological Observations, with Tables 
for their Correction and Notes on Meteorological Phenomena. 
By Colonel Sir H. James. 8«. London, 1860. 
Abstracts of the Principal Lines of Spirit-Levellicg in England 
and Wales. By Colonel Sir Henry James. [With Vol. of 
Plates.] 2 vols. 4«. London, 1861. 
Abstracts of the Principal Lines of Spirit-Levelling in Scotland. 
[With Vol. of Plates.] ' 2 vols. 4^. London, 1861. 
JExtension of the Triangulation of the Ordnance Survey into 
France and Belgium, with the Measurement of an Arc of 
Parallel in Latitude 52° 'N., from Valentia in Ireland to Mount 
Kemmel in Belgium. By .Colonel Sir Henry James. 
4«. London, 1862. 
