Servo operated mixing bottle, Rotated 180 degrees back and forth. This is one of four speeds.
The mixer is for tin plating solution, needing a lot of agitation, too much by hand.
The servo position is fed from a lookup table, sinusoidal. The servo distorts that somewhat but you may be able to detect the change.
Recorded with a Phillips Voice Tracer and then tidied and amplified in Audacity.
Type
Wave (.wav)
Duration
0:40.714
File size
6.8 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo
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