Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 220
s, and marks the paper. Onthe whole, this form of telegraph is more sensitiveand efficient than the electro-magnetic, and less liableto derangement; from the absence of the lever, it isalso more compact. A small armature may be placedacross the coils above, as described in <§> 290, by… … clock-work annexed, for carrying the paper, in themanner already described in connection with theelectro-magnetic telegraph. The coils of the axial 204 D AVI S S MANUAL. apparatus are partly seen at M. The large scroll ofpaper is shown at S, with the strip, P P, proceedingfrom it. The arrangement…
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-255-180.webp)
