3D TRAK

[P3D Bart Vincent Kelsey <bvk@xxxxxxxxxxxxxxxxxxxxxx>]

G'Day. My name is Bart Kelsey and this is my first attempt at conversing
on the net. I am a member of the Victorian 3D Society, Melbourne,
Australia. At a recent auction of 3D equipment at the club, I purchased a
sliding device for sequential 3D photography, called the 3D TRAK. It
allows me to mount my SLR on the track, lock it there, take the exposure,
release and slide the camera horizontally to the second taking position
and expose once again. This is all fine. 
My question relates to the scale present on the base platform which is
similar to the grid on graph paper. One would expect that the horizontal
displacement between the first and second camera positions could be read
off the scale. However, the distance in centimetres that one moves does
not correspond to the distance indicated by the horizontal scale. For
example: there is a line with the number 10 marked at both ends. However,
locking the camera at each end for sequential shots does not result in a
horizontal base separation of 10 centimetres. It certainly doesn't look
like corresponding to inches! Even the vendor was unsure of the nature of
the scale since he had not been privy to the instruction manual either. 
The 3D TRAK was a U.S. invention. I have no idea how old it is, but have
been informed that they are currently in production over there now.
If anyone out there could enlighten me I would certainly appreciate it. 




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