Old wheel with blades, in Argelès-Gazost (Hautes Pyrénées), in continuous operation thanks to pure water flowing quite quickly in a large channel, near a dwelling house. UCS Category: MACHAntq. Duration: 02:47.
Passage of a steam locomotive in a small tunnel. Buzzer at entry and exit. Check-in from the first car. Recording in the town of Martel, France. UCS Category: TRNSteam. Duration: 01:13.
Distress signal "SOS" in international Morse (sound) alphabet. the Morse is formed of "dit" and "dah" (of points and features). 1 "dah" equals 3 "dit". The spaces between the letters are equivalent to 1 "dah", except for the SOS, which must be sent as if it were a single letter, that is to say not using an inter-letter interval. Ends with a space between the words equivalent to 7 "dit". Realized on a computer with a sine wave of 800 Hz. For more information on Morse: en.wikipedia.org/wiki/Morse_code. UCS Category: COMTelm. Duration: 00:03.
