new icn messageflickr-free-ic3d pan white
Image from page 461 of "The principles of physics" (1895) | by Internet Archive Book Images
Back to photostream

Image from page 461 of "The principles of physics" (1895)

Identifier: cu31924031227790

Title: The principles of physics

Year: 1895 (1890s)

Authors: Gage, Alfred P. (Alfred Payson), 1836-1903

Subjects: Physics

Publisher: Boston, London, Ginn

Contributing Library: Cornell University Library

Digitizing Sponsor: MSN



View Book Page: Book Viewer

About This Book: Catalog Entry

View All Images: All Images From Book


Click here to view book online to see this illustration in context in a browseable online version of this book.



Text Appearing Before Image:

ass tumblers, used as legs. Let a person, whom we willcall John, stand on this stool, and hold in one hand one end of a wire(say) 4 yds. long, the other end of which is attached to the disk of an electroscope, a. Let asecond person, James,strike John with a catsfur; the leaves diverge.6. Substitute a white silkthread for the wire, touchthe electroscope with afinger so as to dischargeit, and repeat the last op-eration ; the leaves do notdiverge, c. Let Jamesstrike John several timeswith the fur, and thenbring a finger knucklenear to some part ofJohns person, e.g. thechin, nose, or a knuckle(Fig. 336); an electric spark will pass between the two and both willexperience a slight shock. The electricity which had accumulated onJohn in consequence of his insulation, escapes or is discharged throughJames. > If the air were a conductor of electricity, a body could not be cliargad in it;there could be no thunder storms, and man would probably never have known of theexistence of electricity.


Text Appearing After Image:

Fig. 336. ELECTRICITY ACTS ACROSS A DIELECTRIC. 441 Section II. INDUCTION. 401. Electricity acts across a dielectric. Experiment 1. —Fig. 337 represents an empty egg-shell covered withtin foil to make it a good conductor. It is suspended from a glass rodby a silk thread, a. Electrify aglass rod and bring it near theshell. The shell moves toward therod. 6. Next introduce a glassplate between the rod and shell.The shell approaches the rod asbefore. The chief lesson we learnfrom this experiment is thatelectricity acts across a dielec-tric} In a the dielectric wasair ; in b, air and glass. 402. To determine what ac-tually happens on an insulatedconductor when an electrifiedbody is brought near. ^^^- ^^• Experiment 2. — a. Suspend, as above, two shells so as to touch eachother, end to end, as in Fig. 338, thus making practically one conductor.Bring near to one end of tlie shells a sealing-wax rod, D, excited with—E. While the rod is in this position carry a thin strip of tissue pap



Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

0 faves