the propulsion of of both strands as there are threads in a strand, count- and when the moment arrives for the services of the the blood toward the lungs. The continued use of the ing backward from the place where the two strands belt being required, all the wearer has to do is to pull… … of work which would otherwise have tobe bored. The earbon core does not break in the mould, and often may be used the second time. These cores are said to resemble electric light car- about 5 days 20 hours, and at that point a single thread is cut and removed. bons, and are perforated…
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-335-188.webp)