Abstract
IN NATURE, vol. xvii. p. 123, I noticed a letter by A. Mackennah on an explosion of malt dust in a grinding machine. This I believe to be not an uncommon occurrence, as I hear there have been three explosions in our mill within a period of four years, and these not due to any such culpable carelessness as allowing a naked flame to approach the heated impalpable dust, but ignited either by a spark from a piece of flint passing through the steel rollers (barley from some localities is invariably accompanied by quantities of small fragments of flint), or from excessive friction on some part of the wood fittings.
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