Note 20 — Chapter V · OPERATIONS OF 1839.
Reading edition
Miners and quarriers, who always work by empirical rules, disregard entirely the line of least resistance as a measure for the charge, and invariably refer to the depth of the bore.
Reading edition
Miners and quarriers, who always work by empirical rules, disregard entirely the line of least resistance as a measure for the charge, and invariably refer to the depth of the bore.