The reason that a special shape is given to the identification plug rather than a mark is to enable the operator to distinguish in the dark the character of the signal light by the sense of touch. Figure 66 shows the different types of these identification plugs.
The identification plug is made of hardwood, 2 inches in diameter and 1 1/4 inches deep, and is shouldered 1/16 of an inch in order to permit the lower part of the plug to be introduced into the rocket head.
Fig. 63. - Folded parachute ready for insertion in head.
The band consists of a strip of rope manila 20-pound stock cut into strips 1 1/2 inches wide by 8 inches long. This strip is given a coat of paste, wrapped around the end of the rocket head and crimped for about 1/2 inch around the identification plug. Figure 68 shows this band in place.
The rocket head is now attached to the rocket body by slipping it over the muslin drumheaded end of the rocket body, the muslin having been previously given a coating of glue. The rocket body is telescoped into the rocket head approximately 3/4 of an inch.
Fig. 64. - Briquette attached to parachute.
This band consists of a strip of light unbleached muslin, 1 3/4 inches wide by 12 inches long, which encircles the rocket twice, half of its width pasted to the rocket head and the other half attached to the rocket body, the muslin having been given a coat of paste on both sides.
Fig. 65. - Briquetted light with protecting disk.
Fig. 66. - Identification plugs.
Fig. 67. - Placing identification plug in position.
Fig. 68. - Rocket head showing band holding identification plug in position.
The rocket body is given a coat of gray paint irrespective of the character of the signal. A formula for a standard paint is as follows -
3 gallons of alcohol.
5 pounds of rosin.
15 pounds of powdered orange shellac.
30 pounds of white lead (dry).
1/4 ounce lampblack.
The rocket head is painted to represent the color of the signal. The same formula may be used for this paint as previously mentioned, with the substitution of the coloring matter for the lampblack.