ment already described, the message pipe is closed by means of the sluice valve, T, Fig. 4, and the bottom of the tube being open the carrier falls out of the message chamber, M. It’ will be rémembered that be- as little friction as possible) and forces it onward to its des- fore the admission of… … mains in the pipe expands to handle, H, Fig. 5, is pushed back to its normal position, thus the atmospheric pressure through the distant end of per part of the tube before the lower the pipe only. To receive a part is opened, and preventing any carrier, the cock, D, Fig. 5, is opened, and a…
Internet Archive · Public domain (published before 1931). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten06unit-398-0.webp)
