TY  - JOUR
T1  - Observations and Experiments on the Daily Variation of the Horizontal and Dipping Needles under a Reduced Directive Power
JF  - Philosophical Transactions of the Royal Society of London (1776-1886)
VL  - 113
SP  - 326
EP  - 341
PY  - 1823/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1823.0025
M3  - doi:10.1098/rstl.1823.0025
AU  - Barlow, P.
ER  -