sage pipe is closed by means of the sluice valve, T, Fig. 4, and the bottom of the tube being open the carrier falls Outfof the message chamber, M. If will be remembered that be- as little friction as possible) and forces it onward to its des- fore the admission of compressed tination. If it be… … HE mains in the pipe expands to handle, H, Fig. 5, is pushed back to its normal position, thus the atmospheric pressure producing a reverse motion of the valves by closing the up- through the distant end of Pig. 6.-PNEUMATIC TRANSMISSION SLUICE. per part of the tube before the lower the pipe only.…
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