me- valve in the tank opens. The falling of the water chanicai means. causes the float to descend and the bridge-wall passage Mr. Dock’s device, as our illustration shows, consists door to open, thereby admitting air to the furnace. of a steel disk mounted on a slidable holder and pro- The ciosing… … somewhat deeper cut, is made. After each cut the HOME-MADE FENCE TELEPHONE SYSTEM. lathe is reversed and uw new and ‘finer cutter presented to the work. The last cut cleans up the thread exact- ly asin the final cut of a single-point tool. There are, compares well with the lines of the regular…
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