It is not easy to keep the muffles permanently tight, and as soon as any leakages occur, either hydrochloric acid must escape into the fire-flue, or some fire-gases must enter into the muffle. [Please select]
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It was bad stuff when we read it, and explained the darned leakages in important noos we've been up against. [Please select]
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There were great currents of tendency, it is true, but there were also backwaters, eddies, admixtures, readmixtures, and leakages from one main area to the other. [Please select]
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