DESCRIPTION. The 26 electrical impact fuze is of a special type using only a single firing circuit under the B plunger. The A plunger may or may not be present. The reservoir con-denser can be charged after depressing the plunger remote from the loacting pin. This action in addition to charging the condenser also serves to break the connection bet-ween the firing condenser and the igniter. In addition to an impact trembler switch of the normal type, a pressure switch is included consisting of two small discs of thin metal. The outer disk is mounted 0.1 inch from the fixed inner switch. This metal is usually brass. An open tube leads from the nose of the bomb of this pressure switch, contact is made through the side of the fuze pocket. The air pressure switch as it is commonly cal-led, is closed when the bomb is a few feet away from its target. This condition is resul-tant of an increased aerodynamic pressure in the air column filling the tube. Should this air pressure switch fail to function the normal vibrating trembler switch operates on im-pact, detonating the explosive charge of the bomb instantaneously. (See fig. 147, parts A and B.)

Figure 147A – (26) Electrical Impact (Special)

OPERATION. The fuze is located in the bomb with the B plunger remote from the nose of the bomb. The storage condenser is charged through this plunger and when the pro-per charge has leaked through the resistance, the firing condenser is then charged and the fuze is armed. Future functioning of the fuze is normal except in the case where the air pressure diaphragm switch operates. The most likely use for the fuze as mentioned above, is in bombs having a vesicant liquid filling to insure good scattering of the filling.

Figure 147B – (26) Electrical Impact (Special) Wiring Diagram