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“Flat-flame burners, or burners which spread their flame in a broad thin sheet, are of two principal kinds known respectively as “fishtail” and “batwing” burners. The fishtail or union burner has two orifices driller in its surface, which are inclined towards each other at the angle of 90 degrees, so that the issuing currents impinge and spread the flame in a broad sheet.” — Encyclopedia Britannica, 1893


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


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