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. Illustrations have been moved so they do not break up paragraphs. Typographical and punctuation errors have been silently corrected. Coal Age ▼ Electric Railway Journal Electrical World ▼ Engineering News-Record American Machinist ▼ Ingeniería Internacional Engineering & Mining Journal ▼ Power Chemical & Metallurgical Engineering Electrical Merchandising…
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