A contact beach mine designated by the Japanese as "Small Type Mine, Model 2". A single electrochemical horn protrudes from the top of the mine case, and snag lines and trip wires may be attached to the horn. This mine has generally replaced the JE as a beach and land mine. It will be found in shallow-water approaches to beaches and on reefs; on beaches above the high water mark; and along roads and landing strips of air fields.

A general description of the mine is as follows:

Case

Shape – Truncated cone 14".5 in diameter at base and 7" in diameter at top.

Height – Case only, 10".25; case with horn, 14".6.

Charge – 22 lbs. (approx.) cast Type 98 explosive.

Weight – 52.5 to 62.5 lbs.

External Fittings

Horn – One, electrochemical, on the cover plate, slightly off center.

Cover Plate – 5".2 in diameter in the top center of the case.

Filling Hole Cover – 3".25 in diameter, in the base.

Arming Plunger – 0".5 in diameter, on the cover plate beside the horn. It contains two 0".2 diameter safety-pin holes.

Carrying Handles – Two, 180° apart and 4" below the top of the case.

Operation

The detonator is housed in the booster when the mine assembled. When planted, a safety pin is manually withdrawn from the arming plunger, and the plunger moves down under spring pressure and bridges the arming switch contacts in the firing circuit. This arms the mine.

The mine fires when the horn is bent sufficiently to break its glass vial allowing elec-trolyte to run into a battery cup and generate sufficient current to fire the detonator.

Safety Precautions

The JG contains no self-disarming features. When used as a land mine it has been found buried with other explosives.

Figure 17 – Cross section of mine type JG. Note the various shapes of the mine cases.

Figure 18 – Mine type JG.

Figure 19 – Type JG in the water.