Letter | Published:

Mechanism of Ignition by Local Sources of Heat

Naturevolume 166pages2829 (1950) | Download Citation



THE conditions under which combustible materials may be ignited by contact with hot bodies have been the subject of intensive investigations, mainly with the object of determining the minimum temperature of the body necessary for ignition. Experiments have recently been reported by Jones1 in which the energy necessary to ignite certain deflagrating solids by means of a hot wire embedded in them was measured, the wire being heated by means of an electric current maintained for a limited time. The experiments showed that a definite amount of energy must be supplied to the wire for ignition to result, this quantity decreasing as the rate of supply increases, but still remaining finite even when the rate of supply is infinite, corresponding to the instantaneous generation of heat in the wire.

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  1. 1

    Jones, E., Proc. Roy. Soc., A, 198, 523 (1949).

  2. 2

    Stout, H. P., and Jones, E., Third Symposium on Combustion, Flame, and Explosion Phenomena, 329 (Wisconsin, 1949).

  3. 3

    Silver, R. S., Phil. Mag., 23, 633 (1937).

  4. 4

    Paterson, S., Phil. Mag., 28, 1 (1939).

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