Curved or "warped" mount stereo cards

[P3D Bill C Walton <bill3dbw3d@xxxxxxxx>]

A couple of folks asked about the curved /warped 
mounts used by some stereoscopic  companies
 and wanted to know the advantages of it.  

According to W,C . Darrah, in his book "The World 
of Stereographs" published in 1977,   the curved mount 
was adopted by B. W. Kilburn in the late 1870s and the thought
behind it was that it supposedly increased the illusion of depth.
Another theory, subscribed to by some knowledgeable individuals
is that the curved mount was adopted as it cut down on the glare 
when viewing.

Mr Singley started Keystone View company in 1892,according 
to Darrah, so he was a rather latecomer on the curved mount.
After its introduction by Kilburn it became the industry standard.

I know a lot of stereographers who make stereo cards, but the only 
one I am aware of today that is producing a curved mount card 
is Thomas A Gillam , of Perkasie PA.  He says 
"They look cool" and I can't argue with that.

BILL C WALTON
MUSCOGEE 3-D
bill3dbw3d@xxxxxxxx


------------------------------