Abstract: A modified explosive shock tube is provided which has a lateral energy output and hence may be used as a trunk line in a non-electric blasting network. The modified shock tube comprises a hollow, flexible plastic tube having a layer of energy-producing material on its inner surface and also having at intervals along its length, cuts or slits which penetrate the tube wall. The area of the slits has an overcovering of a waterproof material. When energized, the tube will burst at the area of the slits to release energy in a direction lateral to the tube axis.

Abstract: A cast or pressed explosive primer is provided which is adapted for slidable initiating engagement with a detonating cord. The primer comprises two hermetically sealed shells or cups which are connected together. One shell contains a sensor/signal carrier/delay cap combination and the second shell contains the explosive primer charge. Guides are provided on the outside of the shells for the threading therethrough of a detonating cord. The construction provides protection against the ingress of water or other liquids which may desensitize the initiation system.