TY  - JOUR
T1  - Preliminary Abstract of Approximate Mean Results with the Invariable Pendulums Nos. 4 and 1821, in Continuation of the Abstract Published in Vol.XIX. of the Proceedings
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 23
SP  - 316
EP  - 317
PY  - 1874/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1874.0045
M3  - doi:10.1098/rspl.1874.0045
AU  - Heaviside, W.
ER  -