Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 clianical motions which record or indicate the messages sent. In some manner the molecules of a conducting wire prevent the escape of energy to the outside ether as the walls of a speaking tube confine the sound waves developed in them, preventing them from being dissipated in the surrounding air and allowing them to travel to the end only slightly enfeebled. When a glass rod is rubbed with a piece of silk or fur the mechanical action develops a state in the ether of the rod wh
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 clianical motions which record or indicate the messages sent. In some manner the molecules of a conducting wire prevent the escape of energy to the outside ether as the walls of a speaking tube confine the sound waves developed in them, preventing them from being dissipated in the surrounding air and allowing them to travel to the end only slightly enfeebled. When a glass rod is rubbed with a piece of silk or fur the mechanical action develops a state in the ether of the rod which is shown by the ability of the rod, in this condition, to attract hght objects to it. When a person speaks in front of a telephone the sound waves produced by the vibration of his vocal cords set the metal plate, near the end of the telephone magnet, swinging in unison with the vocal cords, and the approaches and recessions of this plate so disturb the ether of the magnet as to cause it to take up a part of the energy of the vibrating plate and then to transmit it to the ether of the wire wrapped about the magnet and leading to the receiving- station, where, by another of those wonderful yet universal transformations of energy, the action is reversed and the me- chanical swing of the plate in the receiving telephone gives back the words which set up the action at the sending station. 135. Atmospheric Electricity.—What the origin is of the intense electrical manifestations associated with thunder Fig. W.
Size: 1275px × 1569px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
