Altimeter Switch

Small Clearance

HOW TO USE:

Contacts Taped To Container

This switch is designed for use with explosives placed on aircraft. It will close an electrical firing circuit when an altitude of approximately 5000 ft (1-1/2 KM) is reached.

MATERIAL REQUIRED: Jar or tin can

Thin sheet of flexible plastic or waxed paper Thin metal sheet (cut from tin can) Adhesive Tape Connecting Wires

PROCEDURE:

1. Connect the altimeter switch in an explosive circuit the same as any switch.

2. Place the explosive package on airplane. As the plane rises the air inside the container will expand. This forces the plastic sheet against the contacts closing the firing circuit.

NOTE: The switcn win not function in a pressuriaea caoin. It must be placed in some part of the plane which will not be pressurized.__

Ion vn

No. 6 PULL-LOOP SWITCH

1. Place sheet of plastic or waxed paper over the top of the can or Jar and tape tightly to sides of container.

NOTE: Plastic sheet should not be stretched tight. A small depression should be left in the top.

Depression

Plastic Sheet

Depression

Plastic Sheet

2. Cut two contact strips f«>om thin metal and bend to the shapes shown.

Outside Diam. of Container

Small Hole

1/2 Diam. of Container

Small Hole

3. Strip insulation from the ends of two connecting wires. Attach one wire to each contact strip.

NOTE: If a soldering iron is available solder wires in place.

Contact

This switch will initiate explosive charges, mines, and booby traps when the trip wire ia pulled.

MATERIAL REQUIRED:

2 lengths of insulated wire Knife

Strong string or cord

Fine thread that will break easily

PROCEDURE:

1. Remove about 2 inches of Insulation from one end of each length of wire. Scrape bare wire with knife until metal is shiny.

2. Make a loop out of each piece of bare wire.

3. Thread eaoh wire through the loop of the other wire so the wires can slide along each other.

NOTE: The loops should contact each other when the two wlres are pulled taut.

lllii

HOW TO USE:

Loop of Bare Wire

Insulated Wire

Contact

Connecting Wire li*2

4. Place contact strips over container so that the larger contact is above the smaller with a very small clearance between the t ^^ O I

1. Separate loops by about 2 Inches. Tie piece of fine thread around wires near each loop Thread should be taut enough to support loops and wire, yet fine enough that it will break under a very slight pull.

Loops

Fine String

Was this article helpful?

0 0

Post a comment