180 MESSES. SMITH AND EVANS ON THE EEEECT OE THE LENGTH OF 
Appendix II. (continued.) 
Experiments with Soft iron Cylinders (with hemispherical ends) directed towards centre 
of Compass. (Plate V.) 
Ends of Cylinders placed 4.| inches from end of needles, or in same position as adopted 
for correcting the quadrantal deviation of an Iron ship. 
Length of Cylinders, including ends, 12 inches, diameter 3 inches. 
Magnetic direction of 
point 90’ from cylinders. 
Deviation of compound 
needles, card 7'6 inches. 
Deviation of single bar 
needle 7'5 inches. 
North. 
0 0 
6 20 w. 
N. by E. 
5 low. 
1 40 „ 
N.N.E. 
6 50 „ 
4 10 „ 
N.E by N. 
8 0 ,, 
6 50 „ 
N.E. 
7 35 „ 
9 0 „ 
N.E bv E. 
6 40 „ 
9 10 „ 
E.N.E. 
4 30 „ 
8 0 „ 
E by N. 
2 20 „ 
4 30 „ 
East. 
0 0 
0 50 W. 
E by S. 
2 5 E. 
3 15 E. 
E.S.E. 
3 50 „ 
7 10 „ 
S.E by E. 
5 45 „ 
8 45 „ 
S.E. 
7 10 „ 
8 40 „ 
S.E by S. 
7 45 „ 
7 25 „ 
S.S.E. 
7 10 „ 
4 45 „ 
S by E. 
5 15,, 
1 45 „ 
South. 
0 0 
0 0 
S by W. 
5 5 W. 
1 30 W. 
S.S.W. 
6 40 ,, 
4 0 „ 
S.W by S. 
/ 35 ,, 
6 15 „ 
S.W. 
7 20 „ 
8 40 „ 
S.W by W. 
6 45 „ 
9 20 „ 
w.s.w. 
4 40 „ 
8 0 „ 
W by S. 
2 35 ,, 
4 35 „ 
W est. 
0 0 
0 30 W. 
W by N. 
2 5 E. 
4 0 E. 
W.N.W. 
3 45 „ 
6 50 „ 
N.W by W. 
6 30 „ 
8 50 „ 
N.W. 
7 20 „ 
8 20 „ 
N.W by N. 
7 55 „ 
6 50 „ 
N.N.W. 
7 30 „ 
3 20 „ 
N by W. 
5 5,, 
1 40 „ 
Postscript. 
Since this paper was read to the Eoyal Society, Mr. Evans has observed the deviations 
of the corrected Standard compass of the Great Eastern at Milford. The position of the 
compass had been altered, but without any new adjustment being made. 
