Underscores "_" before and after a word or phrase indicate _italics_ in the original text. Equal signs "=" before and after a word or phrase indicate =bold= in the original text. Small capitals have been converted to SOLID capitals. Hyphenation in the original is inconsistent, this has been retained. Subscripts are represented as _N and superscripts are represented as ^N where “N” is an integer. BY ARTHUR MARSHALL A.C.G.I., F.I.C., F.C.S. CHEMICAL INSPECTOR INDIAN ORDNANCE DEPARTMENT…
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