The socket is a hand-rolled carton made from Bogus paper 0.017 inch in thickness. A strip 5 inches wide and 12 inches long has applied to its surface a coat of paste, the paste being similar to, but not so thick as, that used in rolling the rocket case. This sheet is then formed by hand around a square mandrel 5/8 inch square, producing a case shown in figure 27.
Fig. 27. - Stick socket and spring.
The next operation is to insert between the laminations of this carton a stick spring.
The stick spring consists of a piece of spring steel approximately 1 1/2 inches long and 5/16 inch wide, which has a barb near one end, the other end terminating in three prongs, which are bent inward at an angle of approximately 45°. This is shown clearly in figure 28.
Fig. 28. - Assembling stick spring in socket.
The function of this spring is to hold the stick firmly in the socket.
The rockets are laid in rows upon a bench which has been provided with a raised strip at its edge against which abuts the bottom ends of the rocket bodies. A straight edge about 6 feet in length and 7 1/2 inches wide is laid over the row of rockets, and with a lead pencil a mark is made on the rockets 7 1/2 inches from the bottom. This mark is used as a guide to fix the position of the top edge of the stick socket. The stick sockets are now painted with a stripe of quick-setting glue and pressed in position against the rocket body. The spring in position is shown in figure 29.
Fig. 29. - Rocket body showing stick socket in place.
Fig. 30. - Stick-socket binder in place.
This consists of a strip of stout Kraft paper 5 inches wide. Paste is applied to one side of the paper, which is wrapped around the rocket body and the stick socket, holding the socket firmly in place against the case.
Figure 30 shows the binder in place.
The smoke tracer consists of a small paper carton or tube which is closed at each end by means of a clay heading and contains the yellow smoke-producing mixture.
The tracer is made up of the following parts:
A. A paper carton or shell.
B. Clay headings at both ends.
C. The yellow smoke-producing mixture or composition.
D. Fuse or match.
E. The protecting covers or wrappers.
Fig. 31. - Dimensional drawing of smoke tracer.
The shell is a hand-rolled paper carton made from a strip of Bogus paper 0.017 inch in thickness, cut into strips 4 inches wide by 12 inches long. The surface of this strip of paper is given a coat of paste and the strip rolled over a mandrel, producing a cylinder 4 inches long with an inside diameter of approximately 5/8 inch and an outside diameter of 25/32 inch. Some manufacturers prefer to use a carton 5 inches long so that it will match up in length more nearly with the stick-socket carton. These cartons are set aside to be dried before they are loaded.
The bottom heading is set in the carton in much the same manner as the clay heading is set in the rocket-body case.
Figure 32 shows a hydraulic press which is similar to the presses used for loading the rocket-body cases, with the exception that it is equipped to hold a battery of 24 small cartons in each of the two racks. Position lugs of a diameter the size of the inside diameter of the carton, projecting from the base plate a distance of approximately 1/4 inch, hold the carton in position while being charged. The operation of this press has been described previously. A pressure sufficient to firmly drive the clay home is placed upon the plungers. This pressure should be great enough to form the clay into a compact, firm heading, but not sufficient to fracture the walls of the carton. It should be noted here that no spindles are used in charging the carton and that the plungers employed for ramming home both the charge of clay and the composition are solid rods, in place of the steel tubes used in charging the rocket composition.
Fig. 32. - Gang press for charging smoke tracers.