Acoustic Guitar Construction

You lazy Bagwill! Give me a moment.

Here I drew the position of the upper tonebar, according to what Arnold wrote.
(Explanation for lazy Dave: It is the black line, you have to look for)

I would thank you, but I'm too d**n lazy....

No one an opinion about this early tonebar position?
Seems to me it weakens the lower bout. Less resistence to raising behind the bridge.

The "X" intersection on those older Martins was much closer to the sound hole -- about an Inch.

I am not sure of John's exact measurements for that specific year and model but you can look here and see that the tone bar angles on the pre-wars were different than the modern "D" --- Don't forget that the reason Martin changed the design was indeed to reduce failure incidence -- not to improve sound quality.

http://www.cncguitarproducts.com/templa ... encil.html

Sorry Dave, a bit off topic, but:
Did they change those things also in OO models?
I ask, because my new "customer" wants a foreward shifted X on his OO 12 fretter.
Herman