The drumheads are pieces of 30-pound Kraft paper cut 7 1/2 by 7 1/2 inches, with the corners clipped off, making an octagon. A coat of paste is applied to both sides of these drumheads before they are placed over the ends of the package. The drumheads are smoothed down very carefully against the walls of the package and make a tight fit. A label similar to that used on the inside of the package is now pasted around the center.
Fig. 73. - Assembled rocket labeled and paraffined.
The identification tag consists of a piece of cardboard, one edge of which has the same contour as the identification plug. This disk is attached to the tearing string as shown in figure 73.
The various shapes designating the character of the signals are shown in figure 74.
Melted paraffin is used as a dipping bath. White paraffin with a melting point of 120° F. is melted in a steam-jacketed kettle, the dipping temperature being between 120° and 125° F. Alternate ends of the rocket package are dipped into this bath. Then the whole package is submerged, and withdrawn and placed on a rack to drain. This insures a moisture-tight package, figure 75.
Fig. 74. - Identification tags.
Packages are frequently subjected to a test of thirty seconds' submergence in water to insure satisfactory application of the paraffin coating.
Fig. 75. - Paraffining rockets.
This box is a folded corrugated-paper container, holding 25 rockets, and when assembled measures 17 by 19 5/8 by 11 3/4 inches. Gummed cloth makes a tight seal on both bottom and top of the container, being pasted along the joints and edges. When sealed the box is dipped into a bath of paraffin in the manner shown in figure 76.
Fig. 76. - Paraffining shipping carton.
This is a wooden case of 3/4-inch material in which one of the rocket-packing containers is shipped. The inside dimensions of the box are 20 3/4 by 17 1/4 by 12 inches. The manner of bolting the cover in place is shown in figure 77.
Fig. 77. - Heading-up shipping case.
The sticks are made from soft wood cut 5/8 inch square by 6 feet long. The end of the stick, which is inserted into the stick socket attached to the rocket body, is slightly tapered on three of its faces in order to facilitate its easy insertion into the socket. Two saw-cut notches are cut in the top end of the stick. One of them is cut 3/8 inch, and the other 3/4 inch from the end, about 1/8 inch deep, which permits the stick spring to lock the rocket stick firmly. It is to be noted that the sticks are sent in separate packages accompanying the rockets, to be attached in the field. These sticks are shipped in bundles wrapped in the following manner:
Six sticks are tied by cord at each end with a half hitch. Then nine of these bundles are again tied together with more cord. Two of these bundles of 54 sticks each are bound together. These are now ready to be packed into a crate holding two bundles, or 108 sticks. It will be noted that this arrangement includes an extra number of sticks, namely, 108 for 100 rockets, the 8 extra taking care of the average breakage in the field.