Hand welding machine
The electric hand welding machine from the 1920s welds single chain links together. The welder must place a “U” shaped chain link…

The sound of a police van siren. Police vehicles sirens have different sounds which can be used in combinations to provide an enhanced warning signals. This sound is the one most commonly used by police vehicles.
This siren is mounted in a Volkswagen Transporter, manufactured in 2010.
Sound recorded made at the Traffic Police Station Ljubljana.
Sound recordist: Boštjan Troha
Photographer: Neža Renko
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