ON THE MAGNETICAL RESULTS OP THE VOYAGE OF H.M.S. PENGUIN. 357 
was hauled over the area of maximum disturbance and fixed in any desired position. 
The direction of the stream also favoured the retention of the ship’s head in a 
given direction, an important factor when ship observations are concerned. 
With the exception of one observation, marked No. G, the data for Diagrams B, C, D 
were obtained in this manner, but the remaining observations at Stations 11, 12, 
and 13 were made with the ship under way. The observations of the four days 
are recorded in Tables III. and IV., with their various corrections and final results. 
Diagram 0. Inclination. 
Equal Unea of disturbanee from the Normal. 
1-9 
~-Station N?6. 
Graphic Representation of the Observed Disturbances. 
On Diagram A are shown lines of equal values of the disturbances in the 
Declination taken from Table IV. The figures represent the values of disturbances 
expressed in degrees, the dots denoting the position of the ship’s Standard compass 
at each observation. Lines of no disturbance are drawn plain, easterly disturbances 
dotted, and westerly pecked. The values of the lines are 5°, 10°, 20°, 30°, 40°, 
and 50°. Whilst the general direction of this magnetic shoal is N. 50° E. (true), 
the approximate dimensions of it are 3 miles long by \\ miles at its widest part. 
On Diagram B the observed disturbances of the Dip are shown, and on C and D 
those of the Horizontal and Vertical Forces respectively. The figures are taken 
from Table III., the dots representing the position of the ship as well as the decimal 
point, and the curves of equal value are drawn. 
It may possibly be considered that the observed values of the Declination and 
