Issue 10 and Volume 117.

INDUSTRIAL FIRE SAFETY DEPARTMENTS LET THE WHITER ask you a simple question which has been posed to many men in engineering and in the technical trades, and we will study your answer. Here is the question: “When a storage battery is being charged, what gas is liberated?” In nine out of ten instances the answer given is “hydrogen, of course.” This is only partially correct. It is a fact that not only hydrogen, but also oxygen, is liberated. When current passes through electrolyte, the distilled water (pure H2O) is decomposed into hydrogen and oxygen, there being two parts of hydrogen to one part of oxygen. The oxygen is produced at the last positive plate, and the hydrogen at the last negative plate. Due to its very low density, hydrogen diffuses with the oxygen in the top of the battery cell very rapidly, so that above the liquid is a mixture…

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