The Hum Voltage
For some time it has been observed that an alternating voltage connected to the Hum can be measured coming from the walls of buildings.
This wall voltage is approximately sine wave in shape and has a frequency of 50 Hz (measured in the UK) At first glance the voltage could easily be mistaken for having a direct connection to the mains supply but a closer inspection reveals that this is not so.
1/ The voltage level depends upon the height of the wall
2/ The voltage level is dependent upon the weather and changes dramatically in the presence of a thunder storm.
3/ The wall voltage is not in phase with the mains supply.
Until very recently, the observations were carried out on buildings and produced the following general pattern.
The higher the building the higher the voltage, the highest readings were obtained at the highest points of the building.
The voltage is not evenly distributed over the wall but has patches of highs and lows, also, the voltage reading on the outside of the building is slightly lower than the same on the inside.
The most recent tests have been carried out on isolated walls, that is, walls which are not part of a building. Although the voltage readings were lower, the same general pattern emerged, the higher the wall, the higher the voltage reading. Also, as before, the voltage appeared in patches of highs and lows, indeed, when checking stone walls it was found that the voltage varied with each individual stone.
Both stone and brick walls were tested and it was generally found that stone produced the higher voltage.
It is well known that some of the symptoms experienced by Hum sufferers can be likened to a series of small but continuous electric shocks, and it is most probable that the same process which produces a voltage in stone also produces a voltage in human bone.