Relay based interlocking for railway operation
In railway signaling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as…
Sharpening of an axe with a grindstone
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About the sound
In the audio you can hear the sounds of axe sharpening. The sharpening machine is self made and it works with electricity.
In the recording you can first hear the machine turn on, the grindstone starting to turn, water being poured into the grindstone, the axe blade touching the stone and eventually the machine being turned off.
Sound, photo, video: Antti Makkonen
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