... and Sutcliffe, and which consist in driving them by means of an elongated weight, which passes down the inside of the tube striking its blow immediately above the point. This method of driving is particularly suitable for opera- tions carried on under ...

... of sand. At the top was placed some detonating powder, and into it was tightly fixed a glass tube containing acid. This tube striking against any hard subagent*, such as thin side of a ship, breaks, and the sulphuric acid running into the denotating powder ...