TY  - JOUR
T1  - A Portable Variometer for Magnetic Surveying
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 92
IS  - 639
SP  - 313
EP  - 321
PY  - 1916/03/01/
UR  - http://dx.doi.org/10.1098/rspa.1916.0016
M3  - doi:10.1098/rspa.1916.0016
AU  - Walker, G.
ER  -