35 



sector was used on Kellie Law, Fife, and Cowhythe, BanflFshire. In 

 181-4-15-16 the triangulation proceeded steadily. In 1817 the 

 zenith sector was used on Balta Island, Zetland, a new base line 

 was measured on Belhelvie Links, near Aberdeen, and the 

 triangulation again proceeded in 1818-19. It was suspended in 

 1820, but re-commenced in 1821-22, in Zetland, Orkney, and the 

 Western Islands. In 1823 the large theodolite was removed to 

 England and afterwards to Ireland, in consequence of which the 

 operations in Scotland were entirely suspended during a period of 

 sixteen years. In 1838-39-40 and 41, the triangulation for connect- 

 ing the islands with each other, and with the mainland, proceeded with- 

 out interruption. The principal operations are now completed, with 

 the exception of certain observations that may be required for a few 

 stations, with a view to its publication as a scientific work. 



In 1815 the Ordnance department appointed Dr M'CuUoch to 

 make a geological examination of Scotland ; his researches were 

 continued till 1821, but for want of an accurate topographical map, 

 his labours have unfortunately done much less service than they 

 otherwise would have done to the cause of science. 



In 1819 a military detailed survey of part of Wigtonshire and 

 Ayrshire was commenced on a scale of 2 inches to a mile, by Capt. 

 Hobbsand two eubalterns ; it was carried on, with diminishing num- 

 bers, till 1827, and extended over a space of about 937 square miles. 

 But a survey conducted at so slow a rate, and on so small a scale, 

 afforded no proper ground for commencing a map of Scotland, and 

 the plans will furnish no aid whatever for the general survey. 



In 1834 the Ordnance carried forward a partial secondary 

 triangulation along the Scottish coast, from the Solway Firth to the 

 Firth of Clyde for the use of the Admiralty surveyors. 



TABLE 



