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Butterfield's “The Chemistry of Gas Manufacture."

(Griffin.) Cripps' "The Guide Framing of Gas-holders." (King.) Dibdin's "Practical Photometry." (King.) "Gas-burners, Old and New." (King.) ) Humphrys, “The Chemistry of Illuminating Gas."

(King.) King's “ Treatise on Gas Manufacture.” 3 vols. (King.) The article on “ Coal-Gas,” contributed by Mr. L. T.

Wright to Thorpe's “ Dictionary of Applied Che

mistry." (Longmans.) The Journal of Gas Lighting."

J. H.

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LIST OF PLATES.

PAGE

FRONTISPIECE.

34

TOOLS EMPLOYED IN THE RETORT-HOUSE .
PATENT “STANDARD" WASHER-SCRUBBER.

106

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