On Jul 13, 9:09 pm, "Edwin Pawlowski" wrote:
"BobK207" wrote in message

which is 33.0 to 34.3 degrees pretty good for 1930

Actually, is sucks for any time in serious engineering. Yes, it is well
within limits of tolerances for a house being built today, but the reality
is, ancient civilization was able to work to finer tolerances than that.
Aqueducts built 2000 years ago used angles to plot a course through
mountains and they came out in the right spot on the other side.

Correct. Even a beginning carpenter knows to cut one pattern rafter
and use it to lay out all lthe others. That was known since ancient
times. Shouldn't be any measureable (using a tape and such like
instruments) from one rafter to the next.

A house built back then has probably settled some which would cause
some variation.

Harry K