TY  - JOUR
T1  - On the Present Situation of the Magnetic Lines of Equal Variation, and Their Changes on the Terrestrial Surface. 
JF  - Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London (1800-1843)
VL  - 3
SP  - 195
EP  - 196
PY  - 1830/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1830.0111
M3  - doi:10.1098/rspl.1830.0111
AU  - Barlow, P.
ER  -