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minus 0.5 power of absolute temperature, while for lean flames the negative exponent increases, being 0.85 at an air-propane ratio of 21.0. Effect of Surface CoatingsA series of surface coatings on copper was investigated, with the gas and l3 6 -in. plates at 4lOoF. No measurable differences in quenching behavior were observed for either lean or rich mixtures, for any of the following types of surfaces: nickel, platinum, bright gold, roughened gold, potassium chloride, and water glass. This result indicates that neither the catalytic power of the surface nor its absorptivity for radiation significantly affects the quenching phenomenon.Maxwell's equations are solved for a perfectly conducting conical wave guide and the propagation coefficients of this guide are discussed. The field at the mouth of a finite conical horn is estimated and the radiation therefrom is calculated in integral form. These integrals are solved in series form for horns of small flare angle and moderate length and the results compared with experiment.

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