Re: Good question
Warren in Lancaster, PA
>I can imagine that a sawyer would charge per kerf, but somebody had to get paid to get the log to the sawmill. They would need the same pay whether the log was sawed into eight 8/4 boards or fourteen 4/4 boards or twenty four 2/4 boards. So part of the cost was the volume of wood and the thinner boards would have to be somewhat cheaper.
Follansbee and Alexander both mentioned that in New England oak was often riven while white pine was sawed. There were something like 400 sawmills in New England before 1700, more than in Old England. I don't think white pine rives nearly as well as oak or cedar. The Jersey cedar (Chamaecyparis thyoides) grew in only small patches over the river in Philadelphia county and was not found in other areas in Pennsylvania. For some reason the cedar did not renew itself after being cut and probably became scarce as the 18th century wore on.
The drawer bottoms were not terribly important to 18th century cabinetmakers and I agree, Adam that cheap and easy was the way. I suspect that you can find examples of riven, pitsaw, sawmill, and resawn bottoms, in a number of different woods, whatever was nearby or at hand.