......a scanned in newspaper article...........

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Headache over a humming mystery

There are hums and hums as Winnie the Pooh might have observed (but
didn’t).
There are those hums of the Pooh variety: “Isn’t it funny how a bear
loves honey. Buzz buzzz buzz. I wonder why he does.”
And then there is the Cambridge hum, which has much to do with buzzing
but so far as the resources of British science have been able to
establish nothing at all to do with bears and their passion for honey.
The Cambridge hum is the name of an irritating noise giving hundreds
of Britons sleepless nights and environmental health officers
something of a headache.
The mysterious sound has been reported from various parts of the
country over recent years, but despite intensive research into the
subject scientists have been unable to locate the source or provide a
convincing explanation.
Latest reports of the hum come from York where the city council has
persuaded a group of local citizens to keep night-time diaries in an
attempt to track down the noise.
One local victim is Industrial journalist Mr Bill Lang, who lives in a
detached brick house on the outskirts of the city. “It woke me up at
about three o’clock in the morning towards the end of August.” Mr Lang
recalled yesterday.
I can only describe it at a humming noise like two diesel engines
idling away, slightly off beat with each other. My wife heard it as
well. It went on until about
seven o’clock.”
Initially the noise hit the Lang household about four to five nights a
week, but the frequency has since gone done to two nights. None of
their neighbours are affected. “It’s almost as if some malignant
person was directing it at our house,” said Mr Lang.
The job of hunting the hunting the hum in York has fallen on Local
Pollution Control Officer, Mr Jim Thompson who said yesterday: “It’s
an airborne noise, low frequency with a beat. That’s really all I know
about it.”
Mr Thompson said he had established that the noise - which he has
recorded - has a frequency of about 40 to 42 cycles a second, but such
a long wavelength that it was virtually impossible to establish the
direction of the source.
Intensive research has been conducted into the Cambridge hum by the
Department of Acoustics at Chelsea College, London. Despite the use of
directional microphones researchers have so far been unable to detect
the source of the external hum plaguing the Langs.
Theories include noise created by the jet stream – fast flowing, high
altitude mass of air – or the sound of natural gas flowing along the
national pipe network.


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