Abstract
PROF. DAVID refers to his experiments with Parkinson on the rate of emission of radiation from explosions. In this paper I find no mention of any drying process for the gases, or of any attempt to remove adsorbed moisture from the explosion vessel. I therefore assume that the gases were far from dry, and these experiments can scarcely be compared with those of Garner and colleagues to which I referred. They appear to me to support my statement that the concept of vibrationally activated molecules could not explain afterburning or latent energy of long duration in hydrogen-rich fuels. Also I may perhaps be permitted to quote Prof. David's own words relating to some earlier work on coal-gas–air explosions1, that the “rate of emission of radiation is a maximum about 1/40 sec. before the attainment of maximum temperature”. This effect is also very well shown in the curves of David and Parkinson to which Prof. David refers, Curve A in Fig. 2 showing a difference of about 0.03 sec. and Curve B in Fig. 3 of more than 0.05 sec., although for mixtures rich in hydrogen the effect is not observed.
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