1:40
Refrigerator running, contact mic (4 of 4).
1:33
Refrigerator running, contact mic (3 of 4).
3:28
Refrigerator running, contact mic (2 of 4).
2:30
Refrigerator running, contact mic (1 of 4).
4:07
Air compressor motor running, contact mic (2 of 2).
2:33
Air compressor motor running, contact mic (1 of 2).
0:53
Player piano mechanism, pedals pumping - steady pumping with squeaks.
1:09
Early gasoline engine, Stovers - urgent chugging, water pump.
0:37
Vacuum pump - deep vibration, guttural pulsing.
0:27
IV pump running - steady stutter and whir.
0:19
Blowing a balloon up - multiple puffs, then release.
0:05
Plastic pump toy - airy squeaking. (4)
0:04
Plastic pump toy - airy squeaking. (3)
0:09
Plastic pump toy - airy squeaking. (2)
0:05
Plastic pump toy - airy squeaking. (1)
0:05
Bicycle pump operation - moderate pumps. (7)
0:09
Bicycle pump operation - slow pumps.
0:03
Bicycle pump operation - moderate pumps. (6)
0:05
Bicycle pump operation - moderate pumps. (5)
0:03
Bicycle pump operation - moderate pumps. (4)