Exactly, it's called the Parkhurst rule. The thumb really DOES move. 
Charles Butler

--- On Thu, 9/29/11, Stefan Wöhrmann <[log in to unmask]> wrote:

From: Stefan Wöhrmann <[log in to unmask]>
Subject: Bent - 5  hand
To: [log in to unmask]
Date: Thursday, September 29, 2011, 4:43 PM





Hi Valerie,  


looking at old hand shape designs I noticed that there
have been made some changes in the actual version. I prefer very much the “original”
as printed in your “Lessons in SignWriting” page 44 – showing
thumb and fingers at opposite directions if the fingers are bent at the Middle
Joint – as it can be seen in the right symbol looking at the back of the