EMPLOYMENT. German Percussion Primer used in the 5-cm Q.R., H.E. Cartridge. (See fig. 320.)

DESCRIPTION:

1.25 inches, diameter of lip.

1.0 inch, diameter of body.

0.75 inch, length of the body.

0.281 inch, tickness of lip.

Number of threads, 5 RH.

CONSTRUCTION. The primer is of the normal German type consisting of a brass body with the enclosed cap and brass anvil plug. The cap filling is shaped to fit around the anvil and consists of:

28 precent Mercury fulminate.

34 percent potassium chlorate.

32 percent antimony sulphide.

6 percent glass powder.

The cap is a push fit in the underside of the anvil plug. The magazine contains a 1.44-gram pellet of black powder over a 0.65-gram of granular black powder. The primer is closed by a brass washer and a varnished fiber disk.

ACTION. The cap is pressed against the anvil by the firing pin. The flash from the primer fires the two chambers of black powder and these in turn fire the propelling charges.

EMPLOYMENT. German Electric Primer used in the 7.5-cm Q.F.H.E. Cartridge. (See fig. 320.)

DESCRIPTION. 1.25 inches, diameter at lip. 1.0 inch, diameter of body. 0.28 inch, threa-ded length. 0.19 inch, tickness of lip. 0.75 inch, lenght of body. Number of threads, 5 RH.

CONSTRUCTION. The primer houses an igniter bridge which consists of lead styphnate dipped in gelatin. This bridge has a resistance of approximately 2.2 ohms and is in the circuit with the insulated contact plug, the spring washer, and the primer body. A 31 grain black-powder filling, in both pellet and granular forms, is housed in the upper re-cress of the primer. The top of the primer is closed by an aluminum disk and disks of pa-per or varnshield fiber.

ACTION. An electric current is passed through the insulated contact plug in the base of the cartrigde case. The current passes through the igniter bridge, igniting it, and back to the source by way of the spring washer and primer body. The flas from the igniter bridge ingnites the black powder and this, in turn, sets off the propelling charge.

Figure 320 – Electric Primers C/12 nA and C/22