nstrument called the “ Indicator,” which ignition of the volatile portions of bituminous coal. presses the piston of the indicator up, and the pencil, consists of a small cylinder with a piston in it, mov- ‘This device can perhaps be successfully employed in ¢, passing on the catd, would, if the… … single ascent and descent of the piston, or in une itrises and falls is proportional to the force which Mr. Watt obscrves:— In some cases I place the stroke, as it is teclmically called, a diagram is formed fresh fuel on a grate, as ata, and beyond that grate, ptesses the piston upward or downward.…
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