Direction of the Hum Waves

It is well known that buildings play an important role in the perception of the Hum, indeed, many sufferers cannot hear the Hum outdoors.
The size of building, the materials of construction, and the shape of the roof, all effect the Hum intensity.
It has long been observed that the Hum is louder upstairs and this is most evident in multi-storey buildings, especially in those that have a basement.

Buildings which produce the highest Hum levels are single storey, with high walls a pointed roof, and no ceiling, such as old churches.
To observe these variation in Hum level it is often sufficient just to move through the open doorway of a building, or to move one's head through an open window.
This confirms that the energy which produces the Hum is passing down through the walls of the building.

When the Hum is strong enough to be hear outdoors it is possible to carry out a similar test by observing the Hum level at the top and bottom of a deep ravine.
This observation also shows that the Hum energy travels in a vertical direction.

When making these, and similar tests, it is advisable to ware a pair of good quality ear protectors to remove extraneous noise.

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