How to - Hillbilly Timing Tape

Hold on....a circumference is measured in degrees. 3" or 30", 10 degrees is gonna be 10 degrees on a DB timing light.

You know I thought about it & you're right, a quarter turn (noon to 3 o'clock for instance) is gonna be/read the same on a wristwatch as in a big wall clock just a different diameter. I stand corrected, thank you!