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Subject: Identifying electrical insulation material

Identifying electrical insulation material

From: Nelly Balloffet <nballoffet>
Date: Wednesday, July 4, 2007
Alan J. Hawk <alan.hawk [at] us__army__mil> writes

>I have an X-ray machine that dates to about 1917.  There is a metal
>bar that carries electricity from the high voltage transformer coil
>to the X-ray tube.  The insulation material appears to be multiple
>layers of cellophane.  It is a thin clear plastic.
>Any experts on early twentieth century electronics able to identify
>the material used for insulation?

Could it be mica? It was used as insulation in early irons and

Nelly Balloffet
Paper Star Associates, Inc.
Book and Paper Conservation
543 Illington Road
Ossining, NY 10562

                  Conservation DistList Instance 21:16
                   Distributed: Friday, July 13, 2007
                       Message Id: cdl-21-16-003
Received on Wednesday, 4 July, 2007

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