CONSTRUCTION. The sea message tube is made of aluminum and is painted yellow. The top is closed by a disc with a friction igniter through it. The igniter has a red top and a delay pellet giving a delay of 1 second. The aluminum smoke container is below the igni-ter. It contains a reddish brown powder, the surface of which has a black powder charge to start the burning of the smoke mixture. The container is made watertight by tighte-ning the wing nut. (See fig. 117.)

The smoke container is 5.4 inches in length, has a diameter of 1.75 inches and weighs 0.75 pound.

Figure 117 – Message Tube (sea)

The land message tube is made of aluminum and is painted red. The top cover holding the red-topped friction igniter (1 second delay) is a push fit over the container. Through a hole in the cup-shaped aluminum piece near the cover protrude the ends of four strands run down the side of the smoke container and meet several pieces of fire quick-match below the smoke container. (See fig. 118.) When ignited, the reddish brown pow-der gives off a very bright yellow smoke.

The smoke container is 5 inches in length, has a diameter of 1.75 inches and a weight of 10.3 ounces.

Figure 118 – Message Tube (land)

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