Melting determinations on spectrographic grade RbCl by differential thermal analysis in an internally-heated, gas-media apparatus gave the following constants for the Simon equation, P-P0=A[(T/TO)c-1> (bars, Kelvin). For RbClI=L, PO=1, TO=993.45, A =8122, c = 5.02, sd = 0.5 K. For RbClII= L, PO=7750, TO = 1131.15 A = 5061, c = 6.40, sd = 1.0 K. The solid-solid transition RbClI=II determined by DTA is described by P=4490+T/0.35. The best-fit triple point lies on a liquidus cusp at 1134 K, 7790 b. The results for melting are 3--7 K higher than earlier results. The new determinations are useful in the calibration of experimental apparatus of moderate pressure. They confirm that temperature calibration cannot explain divergent liquidus determinations for the system Ab-H2O. ¿American Geophysical Union 1995