To get the rafters to all be the same height (which is important to have an even roof) we use a scribe to trace the beam arc into the rafter to make the notch cut.
It's a lot harder than it looks, because the beam is all lumpy and tapered and not as exactly straight as we would like it to be, each notch is a different width... and figuring out what that should be for each end of each rafter is a chore.
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