P3D shells reversed in x-ray?

[Peter Abrahams <telscope@xxxxxxxxxx>]

Abram wonders if the individual images of epitonium at my site are
reversed, and yes I believe the individual images were indeed reversed.
I'm now correcting this.  
I hope this is a hint & not a confusing factor: the first coil comes out at
you.  It is not as well focused as the other planes.
Thanks Abram (& did you notice I corrected mass to mAs?)
I also have a pair of this image posted, courtesy of John Toeppen:
http://www.europa.com/~telscope/epitonm2.jpg
All of these images are too big for me to view, but I found an expedient
solution: in internet explorer, copy the images, paste to Word, use print
preview / view two pages.

When mounting these images, I discovered that our hurried day in the
radiography lab had some serious consequences: I did not keep adequate
records of L & R.  With a photograph, it is not hard to detect a
pseudoscopic image.  It is much more difficult with a radiograph.  You have
many variables:
--which way was the shell lying when radiographed: which side was up
--was the film upside down when shooting the conversion to 35mm
--which is the left film & which is right
It is not easy to tell the difference, and I ended up going with what 'felt
best'.
I had only a few days to mount these before the NSA convention in Bellevue,
and was really sweating.  It was my first NSA meeting & I had the mistaken
idea that my images would be scrutinized by critical & merciless crowd.  

Pseudoscopic mounting will reverse the spiral from a right hand spiral to a
left hand spiral.  For reasons I don't recall, this was only partially
helpful to me in mounting, there were just so many variables that I was
having problems.
However, almost all shells spiral in the same direction, by convention
'right handed'.  There is a left handed whelk and maybe a couple others
that are reversed.
--Peter
_______________________________________
Peter Abrahams   telscope@xxxxxxxxxx
http://www.europa.com/~telscope/binotele.htm