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Description: The sea
marker consists of a cylindrical tin-plate body and tail cone containing
aluminum powder, and a detonator-burster charge, which explodes when the
marker is dropped on the sea. The body has an internal strengthening band
near each end. The tail cone is soldered to the body and carries the fins to
which a circular strut is secured. At the other end, the body is closed by a
steel diaphragm. The diaphragm has a central opening, threaded to receive a
plug, which carries a detonator-burster tube. A nose is fitted to this
diaphragm and secured in position by three set screws. Screwed in-to the
nose is a striker guide which slides a striker needle, secured to a striker
head which projects outside the nose. When in its operative position, a
transit safety pin en-gages with the striker head, preventing it from moving
inwards. A second safety pin is provided in the nose. This pin is flanged
and is spring-loaded outward, but normally is held in position by a split
pin to which a withdrawal wire is secured. A securing wire is passed through
the eye of the split pin, around the head of the safety pin and the nose of
the marker, and through a boring in the transit safety pin. |
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Functioning: When the sea
marker has been prepared for use and dropped on the surface of the sea,
impact of the striker head with the water drives the striker needle in-wards
and explodes the detonator-burster charge, which disrupts the body and tail
cone and scatters the aluminum powder. |
