358 
CAPTAIN E. W. CREAK ON THE MAGNETICAL 
Horizontal Force should have been corrected for reduction of the mean Horizontal 
Force due to the iron of the ship previously mentioned. This correction was 
abandoned in view of the fact that, with such large disturbances in which only the 
Diagram C. Horizontal Force- 
Equal lines of disturbance}. - denotes values aboue the Normal 
from the Normal. I ... •< « belon •• " 
nearest degree of Declination and the Horizontal Force to the second place of 
decimals were considered, such correction was unnecessary. Moreover, it is highly 
probable that the ship with her iron frames and her keel between 30 and 40 feet 
