the modern telegraphic establishment. tablishes a communication, through T and 8, with the vacu- um main. A vacuum is produced in T, and the valve is slider, owing to the friction due to the pressure on the sur- Messages are sent from the Central office of the Western face of the obturator. This… … ity is easily attain- The handle, H, is able, the above is then drawn for- found to answer ward, carrying with practical requirements best. To draw cases from the sta- val, forces it open, but, as the shock which the carrier re- it the sluice valve, 8, until the mouth of the message pipe, tions to…
Internet Archive · Public domain (published before 1931). Free to use for anything.
