Vision by radio, radio photographs, radio photograms
Transcriber’s Note:
New original cover art included with this eBook is granted to the public domain.
RADIO PICTURES
C. FRANCIS JENKINS
Washington
Copyrighted, 1925, by
Jenkins Laboratories, Inc.
Washington, D. C.
¶ To the splendid young folks, Sybil L. Almand, Florence M. Anthony, John N. Ogle, James W. Robinson, Stuart W. Jenks, and Thornton P. Dewhirst, who so efficiently assisted in the attainment of Photographs by Radio, Radio Vision, and Radio Photograms, this book, in grateful appreciation, is dedicated.
Born in the country, north of Dayton, Ohio, in 1868, of Quaker parents. Spent boyhood on farm near Richmond, Indiana. Attended country school; a nearby high school; and Earlham College. “Explored” wheatfields and timber regions of Northwest, and cattle ranges and mining camps of Southwest United States. Came to Washington, D. C., in 1890, and served as secretary to Sumner I. Kimball, U. S. Life Saving Service. Resigned in 1895 to take up inventing as a profession. Built the prototype of the motion picture projector now in every picture theatre the world over; developed the spiral-wound paraffined all-paper container; and produced the first photographs by radio, and mechanism for viewing distant scenes by radio. Has over three hundred patents; and maintains a private laboratory in Washington. He is a member of the Franklin Institute, the American Association for the Advancement of Science, and founder of the Society of Motion Picture Engineers. Has several times been honored by scientific and other bodies for original research and attainment.
The rapid development of apparatus for the transmission of photographs by wire and by radio may now be confidently expected, because the public is ready for it. At this very moment it is going through the same empirical process by which motion pictures arrived, and out of which finally the long film strip was born.
In the motion picture development there appeared the spiral picture disc; the picture “thumb book”; picture cards radially mounted on drums and bands; and the picture film continuously moved and intermittently illuminated.
C. Francis Jenkins
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Mr. C. Francis Jenkins
Foreword
Contents
Illustrations
Vision by Radio
INITIAL ACTIVITIES:
PRISMATIC RING:
TRANSMITTING METHODS:
RECEIVING METHODS:
FILAMENT LAMP:
GLOW LAMP:
CONTROL FORK:
RADIO MOTOR:
STROBOSCOPIC LAMP:
SAME WAVE:
MULTIPLE-SIGNAL RADIO:
RADIO VISION:
RADIO SERVICE TO THE EYE:
MECHANISMS EMPLOYED:
SENDING MACHINES—ZINC ETCHING:
SWELLED GELATINE PRINT:
FILLED-IN HALFTONES:
LIGHT SENSITIVE CELLS:
PERFORATED PAPER STRIPS:
RECEIVING MACHINES:
INK PEN RECEIVERS:
CAPILLARY PEN:
ELECTROLYTIC RECEIVERS:
PHOTOGRAPHIC RECEIVERS:
OSCILLOGRAPH RECEIVERS:
LIGHT WEDGE MODULATION:
SILVER WIRE GALVANOMETER:
PNEUMATIC VALVE:
SPARK GAP:
FILAMENT LAMP:
CORONA LAMP:
The First Radio Channel
Nipkow and Sutton
The Amstutz System
The Electrograph
The Baker Machine
The Dr. Korn Machine
Rignoux and Fournier Scheme
The Belin Machine
Radio Corporation Machine
The Braun Tube Receiver
Pictures by Radio in Natural Colors
Prismatic Disc Machines
The Jenkins Prismatic Ring
Jenkins Synchronizing Forks
The Jenkins Picture-Strip Machine
Jenkins Duplex Machine
“Talking Machine” Photograms
Radio Vision
Historical Sketch of Jenkins Radio Photography
The Jenkins High Speed Camera
The Genesis of Radio
Radio Patents of Interest
Washington, the City of Enchantment