Signalling through space without wires
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The Project Gutenberg eBook of Signalling through space without wires, by Oliver J. Lodge
THE HISTORY OF THE COHERER PRINCIPLE.
APPENDIX I.
APPENDIX II.
APPENDIX III.
CURIOUS EFFECTS OF HERTZIAN WAVES.
HERTZIAN WAVES, CARBON MICROPHONES AND “COHERERS.”
APPENDIX IV.
Wiedemann’s Annalen, 38, p. 40.—“On the Dissipation of Negative Electricity by Sun- and Daylight.”
Wied. Ann., 38, p. 497.—Continuation of Same Subject.
Wied. Ann., 39, p. 332.—On a Checking Action of Illumination on Electric Spark and Brush Discharge.
Wied. Ann., 41, p. 161.—On the use of Sodium-Amalgam in Photo-electric Experiments.
The Same, p. 166.—On a Checking Action of Magnetism on Photo-Electric Discharge in Rarefied Gases.
Weid. Ann. 42, p. 564.—Note on a New Form of Apparatus for Demonstrating the Photo-electric Discharging Action of Daylight.
Wied. Ann. 43, p. 225.—On the Dependence of the Discharging Action of Light on the Nature of the Illuminated Surface.
Wied. Ann. 44, p. 722.—On the Dissipation of Electric Charge from Mineral Surfaces by Sunlight.
Wied. Ann., 48, p. 338.—Experiments on the Gradient of Atmospheric Potential and on Ultra-Violet Solar Radiation.
Weid. Ann., 46, p. 281.—On the Behaviour of Alkali Metal Cathodes in Geissler Tubes; On Photo-Electric Discharge in a Magnetic Field; and On the Measure of Photo-Electric Currents in Potassium Cells by means of a Galvanometer.
Wied. Ann., 48, p. 625. On the Photo-Electric Comparison of Sources of Light.
Wied. Ann. 52, p. 433. Further Photo-Electric Experiments.
APPENDIX V.
APPENDIX VI.
APPENDIX VII.
THE FULL PROJECT GUTENBERG LICENSE
SIGNALLING THROUGH SPACE WITHOUT WIRES.
THE WORK OF HERTZ AND SOME OF HIS SUCCESSORS.
Sphere charged from Electrophorus.
Syntonic Leyden Jars.
Ordinary Size Hertz Vibrator.
Two Circular Vibrators Sparking in sympathy.
Holtz Machine, A and B Sparks; Glass and Quartz Panes in Screen.
Zinc discharging Negative Electricity in Light; Gold Leaf Electroscope; Glass and Quartz Panes; Quartz Prism.
Large Hertz Vibrator in action; Abel’s Fuse Detector; Vacuum Tube Detector; Striking of an Arc.
Specimens of Emitters and Receivers.
Various Detectors.
Air Gap and Electroscope charged by Glass Rod and discharged by the Wave Impulse from a moderately distant Sphere excited by Coil.
Microphonic Detectors.
Coherer in open, responding to Feeble Stimuli:—Small Sphere, Gas-lighter, Distant Sphere, Electrophorus.
Experiment showing Filings Tube responding to Sphere, to Electrophorus, and to a Quasi-“Spark” from the Discharge of an ordinary Gold-leaf Electroscope.
Electrical Theory of Vision.
Introductory.—1894.
Demonstration of Ordinary Holtz Machine Sparks not exciting Tube: except by help of a polished knob.
Receiver in Metallic Enclosure.
Optical Experiments.
Reflection.
Refracting Prism and Lens.
Arago Disc; Grating; and Zone-plate.
Polarising and Analysing Grids.
Reflecting Paraffin Surface; Direction of Vibrations in Polarised Light.
NOTE WITH REFERENCE TO ELECTRIC WAVES ON WIRES.
APPLICATION OF THIS METHOD OF SIGNALLING AT A DISTANCE TO ACTUAL TELEGRAPHY.
FURTHER DEVELOPMENTS IN THE TELEGRAPHIC DIRECTION.
SYNTONIC TELEGRAPHY.
Earlier Telegraphic Advances.
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