22 
Lieutenant Foster’s account of 
Britain ; from which it appears that the height of the theo- 
dolite above the level of the sea was - 214 feet. 
Theodolite above the floor of the transit room = 38 
Floor of transit room above the level of the sea =176 
Ball of pendulum above floor of transit room = 5j 
Ball of pendulum above the level of the sea - = 18 iF 
From the nature of the eminence, however, on which the 
pendulum stood, I have taken of the correction so ob- 
tained, as the proper correction due to this elevation. 
