Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/111



Estimate for boring to the depth of one hundred fathoms in the counties of Roxburgh or Berwick, under the usual risks attendant on such operations; by Mr. Buddle in 1807.

Estimates for boring to such great depths cannot in general be offered as accurate, from the stone to be perforated being in some cases so hard as hardly to be bored through at all, and from the great risk of breaking and losing the rods in the hole during the boring.