Rich:

Thanks for the input...appreciated.

1)
28,27,26... look like fingers.
25,24,23 ... looks like palm (4db),hand 5db), fist(6db),.

Mine:
Correct, but it is section A that I am more concerned about.

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not sure what the deal is in Part A... division at 10 and 13

Mine:
See as above.
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“string” addition
you're right... however, if you're looking for 5... why not just measure the 5... why perform string addition.

Mine:
You are now getting into it...ask and we may discover the answer. There has to be a reason because it is too cumbersome to use.

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The bottom lines in part A don't seem to correspond with your numbers unless they are "fractions of fingers"... the number 2 has only 1 line. 1/2 a finger. Why else make 16 lines... unless somebody had to count 7/16...

Mine:
You caught onto the second "hiccup" in the design.
Why did they start with the first digit divided into 2 sections and continue up to and including the 15th digit. It is the most confusing system I have ever encountered.
When using this device you must go to the 9th digit to use a 10th division...likewise with all of them. Why didn’t they divide the 9th digit nine times, and the 10th ten times…and so on? Naturally the numerical noted side (A) makes the other side redundant. Why count from both directions, the other side with cubit symbol markings sharing similar grouped values of digits...absolutely insane...!

Best.
Clive