Automatic telephone exchange – operating
A step-by-step automatic telephone exchange brought into operation in 1921 at a post office in Ljubljana, which was the first automatic exchange…
Cooling water system- nuclear power plant
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01:20
About the sound
This is the sound of a cooling water station at Ringhals nuclear power plant. The engine of the main water pump propels out 5.3 cubic meter of water per second.
Sound Recorder: Fredrik Johansson
Photography: Johan Pettersson
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