OK, another WHY? question.
Why is a 2x4 not?
I know its because of milling etc etc, but why call it a 2x4 when it is NEVER that size.
You can't tell me that it starts out as 2x4 then trimmed down to be straight because the length is a huge factor for that.
Most other engineered lumber is the actual size, 3/4 ply is 3/4 thick.
3/4 MDF is 3/4 even though its pressed into that shape and starts out 3 feet thick, they don't call it 3foot MDF!
Same question for measuring nails in pennies. Has the penny been that size since it was first minted or am I missing something?
I don't think James Burke would cover that.
I did like him in Tomorrows World, yes I am old enough to remember him in that!