plumbago. One end nection with tube wells a slightly modified arrangement has of the applications of the principle is due to the junior mem- of the resistant is connected with a battery, and the current is ber. The piles, says .Engineering, are tubular, and can to be employed in consequence of the… … of the tube instead of directly upon it, as in the ca.se of the BTJTLEB'S BHEOSTAT. piles. In the center of a plug a hole is bored and tapped, into which a rod can be screwed for removing the plug when which rests upon the plumbago and moves over its surface the driving has been completed. The male…
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