[23] Capt. Schaw’s (R. E.) rule for an untamped charge of gunpowder placed as above described is C lbs. = ⅔ L. L. R.2 × B, in which C = charge in pounds, B = breadth of bridge in feet, and L. L. R. = line of least resistance in feet, measured through the arch.
Transcriber’s Note:
Obvious printer errors corrected silently.
Inconsistent spelling and hyphenation are as in the original.