The transient-flame temperature in a gaseous mixture, burning in a constant-volume spherical vessel from a point of central ignition, has long been of interest. Flamm and Mache developed a theoretical analysis relating the adiabatic temperature distribution to measured values of the bomb pressure. In this investigation a modified sodium D-line method was used to determine temperatures at several radii on a spherical vessel. Pressure measurements also were taken. Comparison is offered between the measured transient-flame temperatures and those computed from the Flamm and Mache equations.