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Esteban
09-26-2009, 05:56 PM
Similar process occurs with good conductive metals buried for long time. You need high Z earphones. This is very sensitive. If you touch connections of it and put near a 50 Hz iron solder, you'll hear the 50 (or 60 Hz)... near a 50% of a LM386 level, for example, BUT WITHOUT BATTERY.

PM, March 1906.

Esteban
09-26-2009, 06:10 PM
Now if you wet two fingers with water or spittle (maybe is enough transpiration), and quickly touch the plug contacts of these old headphones, you hear a very low click, without having to be near a source of interference such as 50 Hz, for example.

Esteban
09-26-2009, 06:20 PM
No need to be closed the circuit of the battery in this example. Note that the copper plates are separated by rubber... PM, July 1907.

Max
09-26-2009, 07:41 PM
Plain pathetic

Esteban
09-26-2009, 09:55 PM
In few words, the matter is how can see the things from another angle, not from a short perspective.

Max
09-27-2009, 09:52 AM
from the pathetic perspective maybe