File:Apparatus and methods for measuring electric waves (1906) (14596756797).jpg

Identifier: apparatusmethods00kemp (find matches)
Title: Apparatus and methods for measuring electric waves
Year: 1906 (1900s)
Authors: Kemp, Jacob Garret
Subjects: Electric waves Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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:
llgrow fainter till a point symmetrically placed with respect to thegap is reached the side sparks entirely disappear. This verifiesHertzs explanation of the cause of the side sparks. Hertz then tried the side circuit without the metallicconnection to the oscillatir^ system, and side-sparks appeared fordifferent positions with reference to the spark gap G and theoscillating system. These positions can best be explained with theaid of fig, 2, page 4 . 3y means of apparatus similar to fig. 2,page4 Hertz investigated the disturbances of the surroundingmedium when the oscillating system was vibrating. At every os-cillation an electric wave is sent off from the apparatus into thesurrounding space with the velocity of light, . The wave is prop-agated with the greatest intensity in the direction at rightangles to the metal rods along which the electricity is oscilla-ting. In order to detect these waves the resonator, or circu-lar copper circuit with a spark gap betv/een tv/o brass balls must
Text Appearing After Image:
4 be of such a size that Its natural electrical period of vibrationagrees v;lth the period of the v/aves emitted by the oscillator.The dimensions of the resonator are determined by the theoreticalequation T= STf^^ which gives T In terms of the capacity, C,and the self-induction L, the quantity ^y^J^^^Zbeing determined bythe length of the ring or by experiment. In determining the different positions of tlie resonatorthe following convention will be observed:- The axis of the rad-iator or oscillator is the line joining the centers of the sparkballs, the line thru the spark perpendicular to this line v/ill becalled the base line. Also the line joining the spark balls ofthe resonator will be called the spark axis of the resonator. Ifthe resonator is set in front of the oscillator with its center onthe base line, then there are three principal positions whichthe resonator may occupy, 1. Its plane may be parallel to the axis of the rad-iator and perpendicular to the base line as position, a

Note About Images