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Chuck Schmidt responded (sniped)
I'm going with the assumption that the builder could build a level top tube and I measure the actual angle of the intersection of the tubes with protractor. I think the angle finders using fluid, floats, gravity and a level surface are not as accurate? No?
I do not make the assumption that the builder was accurate as to making the top tube level.
My set-up tosses out headset stack height and axle placement in the rear dropout.
It basically uses the axles to work away from, the top tube as a datum usually can work, but might not.
One can easily have a frame that measures 73° parallel but sits 72.5° (really 72 30') when built or the other way at 73.5°.
my reason to measure was for a handling comparative.
John Jorgensen Palos Verdes Ca
I always likes the Sun Instruments poster I saw in the early 70's: Test, Don't Guess.