TY - JOUR T1 - On a Property of Curves Which Fulfil the Condition $\frac{d^{2}\phi}{dx^{2}}$ + $\frac{d^{2}\phi}{dy^{2}}$=0 JF - Proceedings of the Royal Society of London (1854-1905) VL - 15 SP - 468 EP - 469 PY - 1866/01/01/ UR - http://dx.doi.org/10.1098/rspl.1866.0108 M3 - doi:10.1098/rspl.1866.0108 AU - Rankine, W. ER -