Linear explosive charge with constant detonation velocity and synchronous booster charges

A linear explosive charge with constant detonation velocity, comprising;

• (a) a plurality of series-connected units, or sticks, and means to colinearly join said sticks together in a long linear substantially rigid assembly;
• (b) each stick comprising;
• (1) a tubular member of selected length and diameter;
• (2) a polarized coupling attached at each end, a female coupling at one end, and a male coupling at the other end;
• (3) a helical winding of linear explosive cord on the outside surface of said tubular member, near each end of said stick, said explosive cord inserted through an opening in the wall of said stick, with the ends of said cord extending outwardly through said couplings for selected distances;
• (4) at the end having the female coupling, a selected length of thick-walled elastic tube inserted over the end of said explosive cord into the end of said stick;
• the inner diameter of said tube less than twice the diameter of said explosive cord;
• whereby when the end of said cord extending from the male end of a first stick is inserted into said elastic tube inside the female coupling of a second stick, as the joint is made up, said elastic tube will expand and press both ends of the explosive cord together in tight side-by-side contact to facilitate the process of cross-detonation from the cord on one stick to the cord on the other stick.