one part of an equally well pulverized residuum of distilled cannel coal containing still a portion of its bitumen and the whole rubbed together thoroughly till all the three ingredi pipe heads and while the boxes are then heated to the boiling hydraulic pressure into the openings of the heads so that this process united with the increased temperature not only com bines the carbonaceous mass into compact pipe heads but al 1869 SCIENTIFIC AMERICAN INC., 1869-04-03
one part of an equally well pulverized residuum of distilled cannel coal containing still a portion of its bitumen and the whole rubbed together thoroughly till all the three ingredi pipe heads and while the boxes are then heated to the boiling hydraulic pressure into the openings of the heads so that this process united with the increased temperature not only com bines the carbonaceous mass into compact pipe heads but al 1869 SCIENTIFIC AMERICAN INC., 1869-04-03
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