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PURIFICATION.

For conducting the purification of gas in small works very compact and convenientarrangements have been made by Mr. Bower, of St. Neots, and by Messrs. Holmes and Co.of Huddersfield, in which the condensers, purifiers, and scrubbers are all combined. Fig.72 represents an elevation of Mr. Bower’s combined purifying apparatus, suitable for worksthat supply from 400 to 800 burners. The condensers are formed by the pilasters on thesides, the gas being made to traverse them all in succession. Access to the interior of eachpipe may be obtained by screw plugs, one of which is placed over each pilaster; andalso by small hand-holes at each end, near the base. The washer, or scrubber, forms part otthe inlet box, which is situated on the opposite side of the apparatus. The interior isdivided by a partition into two compartments, so as to form two dry-lime purifiers, each otwhich is provided with appropriate sieves; and the covers are fitted with twin-buckles tohold them down, and with eyes for attaching them to the lifting gear. There is a valve in

Fig. 72

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the centre, easily worked, for changing the direction of the gas through the purifiers. Thelifting carriage at the top needs no explanation. The condenser, base, and scrubber are eachprovided with an overflow pipe, connected with a dip cistern and with the tar well.

Fig. 73 is a section showing the arrangement made by Messrs. Holmes and Co., which is