I have recently made some new measurements of the Hum energy using an optical method. The basic principle is the same as I have described before, that is to measure the depth of modulation produced when the Hum energy interacts with a vibrating spring.
I have found that the average Hum energy measured indoors is about 0.12 watts per square metre Compare this to the results of Allan Frey who found the threshold of microwave hearing to be .03 Watts per square metre. The threshold of human hearing using sound waves is stated as 10E-12 Watts per sq metre The question now is find what source is supplying this relatively high amount of energy over such large areas. It would be of help to compare the figure I have given here with other sources but so far I have found only one person who has estimated the amount of energy needed to produce the Hum. -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hum-sufferers. For more options, visit https://groups.google.com/d/optout.
