. . . . . . . "Flame speeds of methane-air mixtures and ethylene-air mixtures were determined as functions of mixture composition at initial mixture temperatures ranging from 34 to 344 degrees C by a Bunsen-burner method. The data were compared with reported data for propane and air; the maximum flame speeds increased with temperature at increasing rates and were affected on the percentage basis in the decreasing order, methane, propane, and ethylene. Both a thermal and diffusion theory predicted the effect of temperature on maximum flame speed within 20 percent. Straight-line correlations were found between maximum flame speed and calculated equilibrium hydrogen-atom concentration (at adiabatic flame temperature) for each fuel." . . . . . "Effect of initial mixture temperature on flame speed of methane-air, propane-air and ethylene-air mixtures" . "Effect of initial mixture temperature on flame speed of methane-air, propane-air and ethylene-air mixtures"@en . . . . . . . . . . . . . . . . . . . .