TY  - JOUR
T1  - A Comparison of Magnetic Declination Changes at British Observatories
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 98
IS  - 694
SP  - 411
EP  - 414
PY  - 1921/03/03/
UR  - http://dx.doi.org/10.1098/rspa.1921.0014
M3  - doi:10.1098/rspa.1921.0014
AU  - Chree, C.
ER  -