146 
VICE-ADMIRAL SIR C. SliADWELL ON TERRESTRIAL MAGNETISM. 
Yokohama is about three miles from Kanogowa in an E.S.E. direction. There can 
be no objection, for the purpose in hand, to compare the observations made at the two 
places. 
Reducing the Yokohama observations, Nos. 49-51, recorded in Table II., to a mean 
epoch, we have 1873*51, mean dip 48° 55'-3 N. 
Hence in 13-69 years the dip has changed by these observations 46 ,- 6. 
And - ^^ = 3' -40, mean annual change. North dip increasing. 
11. Observations at Yedo. — On Sept. ,22, 1859, observations taken at the Temple 
of “ To-sen-dse,” then the temporary residence of the British Embassy, gave as the value 
of the magnetic dip 48° 21 ,- 8 N. 
In 1872 the embassy was temporarily located at another place, a little east of the 
former position, but nearly on the same parallel. Here we had (Table II. No. 52), 
1872-56, dip 49° 14'-6 N. 
Hence in 13-84 years the dip has changed 52'-8. 
52"8 
And r ~ 84 = 3'-82, mean annual change. North dip increasing. 
12. Observations at Hakodate , Island of Yezo, Japan. — Former observations made at 
Hakodate on Oct. 13, 1859, gave as the value of the magnetic dip, 1859-78, dip = 
55° 23'-3 N. 
The observations given in Table II., Nos. 57-59, reduced to a mean epoch, give 
1873*67, mean dip=55° 36'-8. 
Elence in 13-89 years the dip has changed 13 f, 5. 
13*5 
And I3T9= 0 '' 97 ’ mean annual change. North dip increasing. 
13. Observations at St. Vladimir Bay , Coast of Manchuria. — Observations taken on 
Sept. 2, 1859, or 1859-66, gave as the value of the dip 58° 37'*8 N. 
Comparing this with No. 63, given in Table II., 1873-63, 59° O' N., it appears that 
the dip had changed 22'*2 in 13-96 years, 
22*2 
And y " " =1-59, the mean annual change. North dip increasing. 
Note A. — The observation taken at Malta in December 1861, hereinbefore referred 
to, was communicated to the Admiralty in MSS. in 1862, and is doubtless in the records 
of the Hydrographic Office. 
This observation is referred to in Sir E. Sabine’s Contrib. Terrestrial Magnetism, 
No. xiv., Phil. Trans. 1875, part i. p. 190. 
Note B. — The observation at St. Vladimir Bay in 1859 is referred to in Sir E. Sabine’s 
Paper, Contrib. Terr. Mag. No. xiii., Phil. Trans. 1872, p. 362. 
Note C. — All the observations made by me, 1857-59, above referred to were forwarded 
