Thus F. H. Bramwell, who begins his very brief discussion of the "chlorine bleaching powder industry" (F. H. Bramwell, "Mechanical Engineering in the Chemical Industry," Engineering, 24 June 1949: 597--600, for those coming in late) with the observation that in the vague, early times before the chemical industry, crofters used to boil cloth in alkalis, than lay them out to bleach. "Chlorine was found to expedite the process," and "chlorine stills" were developed for the home production of chlorine. He goes on to describe the Weldon still, which doesn't seem very homemade to me, and says that it worked by the oxidation of hydrochloric acid with manganese dioxide.I assume that manganese dioxide was a common industrial earth, and that people were burning salt in sulphates to produce hydrochloric acid. Which, as these things go, is actually a reasonably safe thing to do.
Or perhaps that's just the sort of thing that Professor Bramwell had learned to say about doings on Britain's blasted heaths.
Fresh from war work at "the X Site," just outside Rhydymwyn, Flintshire, or perhaps just from investigating it, the erstwhile Major Bramwell knew from wild chemistry on wild moors. (Which is to say, I am not giving this trivia up.)
Professor Bramwell explains that Weldon still was assembled of locally-available flagstones, boiled in tar if of porous stone, with seams closed by more tar, hemp cords, and external ties. The aqueous acid was collected as it dripped out of the still. Making bleaching powder involves some extra steps, of which the most hair-raising involves men with handkerchiefs tied over their mouths, raking a powder of hydrated lime laid on the floor of the insufferably hot still until it was deemed sufficiently saturated for sale.
Professor Bramwell explains that Weldon still was assembled of locally-available flagstones, boiled in tar if of porous stone, with seams closed by more tar, hemp cords, and external ties. The aqueous acid was collected as it dripped out of the still. Making bleaching powder involves some extra steps, of which the most hair-raising involves men with handkerchiefs tied over their mouths, raking a powder of hydrated lime laid on the floor of the insufferably hot still until it was deemed sufficiently saturated for sale.
Just in case the imagery I'm invoking isn't explicit enough already: