Note 159 — Chapter V

"The following curious experiments were made some years ago at Quebec, by Major Williams, of the Artillery. Iron shells of different sizes, from the thirteen-inch shell to the cohorn of four inches diameter, were nearly filled with water, and an iron plug was driven in at the fuse-hole by a sledge-hammer. It was found, however, that the plug could never be driven so firmly into the fuse-hole as to resist the expanding ice, which pushed it out with great force and velocity, and a bolt or cylinder of ice immediately shot up from the hole; but when a plug was used that had springs which would expand and lay hold of the inside of the cavity, so that it could not possibly be pushed out, the force of expansion split the shell. The amazing force of expansion is also shown from the distance to which these iron plugs are thrown out of the fuse-hole. A plug of two pounds and a half weight was thrown no less than 415 feet from the shell; the fuse axis was at an angle of 45°; the thermometer showed 51° below the freezing point. Here you see ice and gunpowder performing the same operations. That similar effects should proceed from such dissimilar causes is very extraordinary."—Gray's Canada, p. 309.