Provisions for avoiding Obstructions to Navigation and Interference with telegraphic, &c., Lines Provisions for avoiding Obstructions to Navigation and Interference with telegraphic, &c., Lines 39Avoidance of obstruction or danger to navigation by pipe-lines over or under harbour waters. 40Avoidance of interference with telegraphic, &c., lines. 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Provisions for avoiding Obstructions to Navigation and Interference with telegraphic, &c., Lines