... of sand, into tol> was P lac ed some detonating powder, and as tightly Axed a glass tube containing sul- acid - Thi * tube striking against any hard sub-Bu p ve - as the side of a ship breaks, and the acid inning into the detonating powder is the result ...

... are to taken. These weights sre secured to brass tube at the end ol the line, and about loot or from tbe bottom. When the tube strikes the ocssn bed tbe weight is hooked Irom the line very simple and ingeiiioua process, and is leit on the bottom, while the ...