The chemical delay firing device M1 is a standard device and may be threaded to any hand grenade, anti-personnel mine, or to the bangalore torpedo.

GENERAL:

The Chemical Delay Firinng device is designed for firing explosive charges by delayed action. These device are issued in boxes of ten with different delays. The delay de-pends on the conncentration of the corrosive liquid in the glasses ampoule, the color of the safety tab on each device indiacting the delay of that device. In addition, the de-lay varies with the temperature; a chart with the temperature correction for each de-vice will be found in each box. Following is a temperature correction tabel for the diffe-rent delays:

TEMPERATURE CORRECTION TABLE

Degrees F.

Black

Red

White

Green

Yellow

Blue

150

5 min.

4 min.

25 min.

3/4 hr.

3/4 hr.

1-1/2 hrs.

130

7 min.

6 min.

37 min.

1 hr.

1 hrs.

2-3/4 hrs.

110

8 min.

7 min.

50 min.

1-1/2 hrs.

2 hrs.

5 hrs.

90

10 min.

10 min.

1 hr.

2-1/4 hrs.

4 hrs.

9-1/2 hrs.

70

12 min.

14 min.

1-3/4 hrs.

4 hrs.

6-1/4 hrs.

17-1/2 hrs.

50

14 min.

21 min.

3-3/4 hrs.

8-1/2 hrs.

8-1/4 hrs.

45 hrs.

30

1 hr.

1/2 hr.

7-1/2 hrs.

18 hrs.

16-1/2 hrs.

5 days

10

5 hrs.

1 hr.

11 hrs.

38 hrs.

4 days

9 days

DESCRIPTION:

The principal parts of the device are the glass ampoule containing the corrosive liquid, the spring-loaded striker, the restraining wire preventing the striker from imping-ing on the percussion cap, the standard nipple base, and the identification and safety strip. The restraining wire runs along the side of the ampoule and is securely attached to the end of the device by the screw and lead washer. The safety strip runs through the device between the striker and base and would prevent the device from firing should the glass ampoule be broken in handling or shipping.

OPERATION:

After a blasting cap has been crimped to the base and the device inserted in the ex-plosive charge, the device is actuated by squeezing on the copper tube which houses the glass ampoule. This will break the ampoule and permit the corrosive liquid to react upon the restraining wire. After locking through the inspection hole to make certain that the striker has not already been released, the identification and safety strip is re-moved.

The corrosive liquid will eat through the restraining wire after a pre-established delay (varies according to temperature), and thereby free the striker to be forced down on the percussion cap by the striker spring.

REMARKS:

(1) There is no safe way of disarming this device. If absolutely necessary to disarm, insert safety pin through inspection holes.

(2) Troops must not approach an installed charge employing this delay fuze. Areas where they have been installed should be marked. Time delay starts when tube is squeezed not when safety tab is withdrawn.