The purpose of this little book is to present the essential facts of electrical science in a popular and interesting way, as befits the scheme of the series to which it belongs. Electrical phenomena have been observed since the first man viewed one of the most spectacular and magnificent of them all in the thunderstorm, but the services of electricity which we enjoy are the product solely of scientific achievement in the nineteenth century. It is to these services that the main part of the following discussion is devoted.
o a distance of several hundred yards, and thus took an important step in the direction of the electric telegraph.
It has since been found that FRICTIONAL ELECTRICITY APPEARS ONLY ON THE EXTERNAL SURFACE OF CONDUCTORS.
This is well shown by a device of Faraday resembling a small butterfly net insulated by a glass handle (fig. 5). If the net be charged it is found that the electrification is only outside, and if it be suddenly drawn outside in, as shown by the dotted line, the electrification is still found outside, proving that the charge has shifted from the inner to the outer surface. In the same way if a hollow conductor is charged with electricity, none is discoverable in the interior. Moreover, its distribution on the exterior is influenced by the shape of the outer surface. On a sphere or ball it is evenly distributed all round, but it accumulates on sharp edges or corners, and most of all on points, from which it is easily discharged.
A neutral body can, as we have seen (fig. 4), be charged by
Fans of paranormal and urban fantasy will enjoy... Read more
VOLUME ONE in the WOOD COW CHRONICLES series. <... Read more
2013 SFR GALAXY AWARD WINNER
"Heroism and... Read more
There are six secret clans across the world–Afr... Read more
Set in the late Georgian era, Elizabeth Bailey’... Read more
"Tim Hurtletuta has forgotten something. He can... Read more
12th century England: Two men vie for the thron... Read more
Dr. Gabe Allen has a rule about dating colleagues... Read more
The list of books below is based on the weekly downloads by our users regardless of eReader device or file format.
See more popular titles from this genre.