wireless telegraphy
Radio-based coded messaging
Wireless telegraphy is the transmission of telegraph signals without wires, using radio waves instead.
The term dates from the late nineteenth and early twentieth centuries, before voice transmission became practical.
Marconi's wireless telegraphy revolutionized maritime communication, allowing ships to send distress signals.
The technology eventually evolved into radio broadcasting.
Self-propagating field oscillations
- radio wavesLow-frequency electromagnetic radiation
- frequencyRate of recurrence
- wavelengthSpatial repetition interval
- transmissionSending of information
reception · signal · modulation · amplitude · spectrum · propagation · resonance · oscillation
Electrode separation for discharge
- induction coilDevice producing high voltage
- aerialElevated, or signal-catcher
- antennaBroadcast signal receiver
- oscillatorCyclic signal generator
resonator · galvanometer · relay · sounder · grounding · capacitor · spark coil · cat's whisker
Small circular marks
- dashesShort fast races
- telegraph keyManual code transmitter
- SOSMorse distress code
- encodingConverting data to format
decoding · codebook · dit · dah · speed · words per minute · abbreviations
Spanning the ocean between continents
- patentObvious; inventor's monopoly
- TitanicIll-fated 1912 vessel
- Cape CodMassachusetts coastal peninsula
- NewfoundlandCanadian Atlantic island province
Between boat and land
- distress signalAlert requesting urgent aid
- SOSMorse distress code
- TitanicIll-fated 1912 vessel
- ocean linerLarge scheduled passenger vessel
coastguard · lifeboat · rescue · shipping lanes · RMS Lusitania · merchant marine · Atlantic crossing
- inventionNew device or method
- experimentationSystematic testing of ideas
- demonstrationPublic display of opinion
electromagnetic waves
Self-propagating field oscillations
- radio wavesLow-frequency electromagnetic radiation
- frequencyRate of recurrence
- wavelengthSpatial repetition interval
transmission · reception · signal · modulation · amplitude · spectrum · propagation · resonance · oscillation · ether
spark-gap
Electrode separation for discharge
- induction coilDevice producing high voltage
- aerialElevated, or signal-catcher
- antennaBroadcast signal receiver
oscillator · resonator · galvanometer · relay · sounder · grounding · capacitor · spark coil · cat's whisker
dots
Small circular marks
- dashesShort fast races
- telegraph keyManual code transmitter
- SOSMorse distress code
encoding · decoding · codebook · dit · dah · speed · words per minute · abbreviations
transatlantic
Spanning the ocean between continents
ship-to-shore
Between boat and land
- distress signalAlert requesting urgent aid
- SOSMorse distress code
- TitanicIll-fated 1912 vessel
ocean liner · coastguard · lifeboat · rescue · shipping lanes · RMS Lusitania · merchant marine · Atlantic crossing
Nikola Tesla
- inventionNew device or method
- experimentationSystematic testing of ideas
- demonstrationPublic display of opinion
- radioFM radio, crystal set, AM radio, radio station, radio broadcast
- telecommunicationscell phone, cellphone, signals, cellular network, telephone calls
- Electricity HistoryMichael Faraday, Faraday, Benjamin Franklin, Franklin, Thomas Edison
- telegraphytelegraph, Morse code, telegraph key, telegraph line, telegraph lines
- wireless telegraphyradiotelegraphy, Morse code, spark gap, radio operators, dots and dashes
- vintage radiostube radio, crystal radio, transistor, portable radio, crystal set
wireless telegraphysatellite communication
Transmission via orbiting relay
digital communication · semaphore · signal flags · heliograph · smoke signals
wires, wiring, wireless, rewire, telegraphing, telegraphs, telegraphic, wirelessly, telegraphy