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A patent for improvements in boilers for locomotive engines was obtained by James Frazer, on the 7th May, 1833, upon the basis of which it is said he constructed a steam carriage, but of the completion or performance of which we are at present uninformed. Annexed is a transverse section of the boiler; the fire-place is at a, and the smoke, &c. is conveyed through an eccentrically-curved tube b-b, imparting its heat to the surrounding water, in its progress to the chimney. There are cross pipes, which pass quite through the flue-tube at various places, as shown by the dotted lines, that the circulation of the water or passage of the steam may not be impeded.
The patentee has included in his patent some other modifications of his plans, wherein a great number of small flue-tubes are used to distribute the heat throughout the water, and to serve as supports to the fire-place and flues.