22. DEMOLITION BLOCKS

a. BLOCK, Demolition, M2. Block, demolition, M2 (fig. 17), is a rectangular block of tetrytol 2 by 2 by 11 inches, with a detonator well in each end. At the outer end of each well there is an adapter threaded to receive any of the standard firing devcies. At the inner end of each well, there is a tetryl pellet cast in the block to act as a booster. Each block is wrapped in olive-drab paper on which is printed "BLOCK, DEMOLITION, M2" and "EQUIVALENT TO SIX ½-POUND TNT BLOCKS." This block except for the replacement of the primacord by detonator wells, is similar to BLOCKS, demolition, chain, M1. It is pack-ed in the same manner and has the same properties and uses.

b. BLOCK, Demolition, M3. Block, demolition, M3, is a rectangular 2¼-pound block of plastic explosive 2 by 2 by 11 inches. It is packed in a cardboard box which is marked:

"One block is equivalent to six ½-pound TNT blocks."

(1) This plastic explosive can be moulded by hand into any desired shape or position and is very efficient as a result of the good contact thus obtained combined with its high power. The explosive is plastic at temperatures ranging from 20 F below to 125 F above zero and is resistant to the action of water. BLOCK, demolition, M3, is packed in a card-board box, eight such boxes per haversack, two haversacks per box.

c. BLOCK, Demolition, M4. Block, demolition, M4, is a ½-pound block of high-explosive composition C 2, packed in a cardboard box 6.75 by 1.5 by 1 inches. These are packed without haversack, about 52 pounds per wooden box.