Subject:  (Philips) (Jackson) (Scherer) Re AVOIDANCE (fwd)
Date:     Thu, 14 Jan 1999 065002 -0600 (CST)
From:     "Roy L. Beavers" <rbeavers@llion.org>
To:       emfguru <rbeavers@llion.org>
--------------------------------------------------


---------- Forwarded message ----------
Date: Thu, 14 Jan 1999 10:25:15
From: Alasdair Philips 
To: "Roy L. Beavers" 
Subject: Re: (Jackson) (Scherer) Re: AVOIDANCE (fwd)

...snipped...
>PS : in the epidemiological  data not only electric cooking could be 
>a common link also electric typewriters another female dominated 
>"environment" with permanent electro-magnetic action
>and not everywhere thing are computerized yet..........
>Has anyone data on EMF around electric typewriters ???
>Wolfgang W. Scherer

Do many people still use these things??
I have measured about 9 different makes and types and they all gave
of VERY high power frequency magnetic fields (typically 2 to 10 microtesla
- 20 to 100 milliGauss!!) at the front between the keyboard and the
operator - far, far higher than any computer. This applied to both
electronics deiplay and older pure electric machines and was due to
a very cheap construction of mains->low voltage transformer inside the
machine.  A few electronic ones also gave off high (c. 200-400 volts/metre)
electric fields at the keyboard due to only having a two-wire connection
to the mains because as they were plastic covered they didn't legally
need referencing to Earth potential - very similar to almost all laptop
computers when powere via their mains-adapters.
This E-field problem can be cured by Earthing any metalwork or connecting
one side of the low voltage supply to Earth.

Cheers
Alasdair

 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alasdair Philips    (aphilips@gn.apc.org)
Director, UK Powerwatch,
EMC Engineer and EMF-bioeffects researcher
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Archive provided courtesy of WaveGuide, http://www.wave-guide.org
Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html