CONSTRUCTION. The bomb has a concrete body of the same dimensions as the SC 10. A conical dummy fuze head of block bakelite is fitted to the nose end of the bomb. This fuze head is secured by four evenly spaced wires imbedded in cement extending through the bomb. The wires pass through four housings in the bakelite fuze head, and are secu-red in position at the nose by turning over the protruding ends. The other ends of the four wires are secured by passing each wire through separate eye holes provided at the base of the sheet metal fins and turning over the ends. (See fig. 66.)

A central cavity 11 inches in length is formed within the body a paper cartridge. The cartridge is separated at the nose end from the dummy fuze head by a 1/8-inch thick felt washer.

The paper cartridge contains a glass ampoule, surrounded by a filling of chalk, the am-poule contains either chlorosulphonic acid or fuming hydrochloric acid. On impact, the glass ampoule breaks to release its contents which smoke emits to mark the point of im-pact.

The four tail fins, comprising two sheets of metal which are slotted and interlocked to-gether, are partly moulded into the concrete at the tail end and are secured by two ad-ditional lengths of wire which run laterally through the eye hole and are fastened by twisting the ends of the wire together.

COLOR AND MARKINGS. Body unpainted with 2-inch white band at nose. Tail vanes alu-minum color; nose, black. LFB 110 stenciled on body.

Figure 66 – ZC 10-kg Concrete Practice Bomb