Telegraphy and how to learn it; with brief chapters on elementary science, embracing various kinds of electricity, electrical measurements, thermo-frictional electricty, batteries, magnets and magnetism (1901)
Frederic, Wilson. [from old catalog] · Chicago, The Henneberry co · leaf 17
By placing the conducting wire over andparallel with a magnetic needle, in the man-ner represented in Fig. 1 the north end ofthe needle will be deflected toward the right;but if the cell is turned half way aroundso as to have the position as in Fig. 2 thenorth end will be deflected toward the left.…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-96-22.webp)
