St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 20
Fig. 14. large, the quantity of elecftricity is verj small. It wouldtake thousands of galvanic cells to produce a spark aninch long. While the quantity of static ele(ftricity is ABOUT FRICTlONAIv ELECTRICITY. 17 … Fig. 15. small, its potential, or eledlromotive force (E. M. F.), is very high. We say that an ordinary gravity cell has an E. M. F. of a little over one volt. Five such cells joined in the proper way would have an E. M. F. of a little over five volts. You will understand, then, what is meant when…
Electricity
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Henry Cornelius Agrippa's Fourth book of occult philosophy, and geomancy. Magical elements of Peter de Abano. Astronomical geomancy [by Gerardus Cremonensis]. The nature of spirits [by Gorg Pictorius]. And arbatel of magic (1655)](https://img.insideoutlibrary.com/img/200/ia-cu31924006718757-7-2.webp)
