That is not what I was doing. I was assuming that the writer of that verse was not stupid and I was also using the measurements of the time to show that the verse is reconcilable.
If I could not justify it using a cubit a hand or a span or other biblical measurement criteria, then I suppose I would have had to admit a likely error, as the outside dimension would clearly be about 31 cubits. But the usable space, the space inside the bowl, would be roughly 30 cubits according to your own calculations, wouldn't it?
BTW, have you found that source yet?
The phrase is 'a line of thirty cubits did encompass it round about.' 'Encompass' suggests an outside diameter. There is no mention of hands at all. You're reaching.
BTW, have you found that source yet?
Kansas City Times, Jan 5, 1982.