Dear Jody,

In a simple way my collague (master in mechanics) copies existing and
damaged metal disks for his copied Chordephon No 60.  At first the disk
is copied on yellow colloured light sensitive paper (DIACO: used for
copying large drawings).  In bright sunlight the metal disk is put on
that paper with a glass sheet on it, to hold flat paper. After be
exposed the paper will be developed. The paper will be placed for it in
a can covered with a blanket. In that can some ammonia is placed on a
warm object to get ammonia vapour to develope the paper by waging that
vapour under the blanket.

The result of that practice is given in the attached file
"corddisk.gif", Later on the metal new disk will be punched according
the paper pattern.

Best regards, Gerard Arkenbout
                      Doornenburg 25
                      2261 XB Leidschendam     The Netherlands

 [ Editor's Note:
 [
 [ I have placed the .gif file (image data) in the FTP archive:
 [
 [       ftp://ftp.foxtail.com/pub/automatic-music/misc/corddisk.gif
 [
 [ Jody
 [