Fishers - Press Release - August 12, 2004
A SUPER SENSITIVE DETECTOR
FOR FINDING SHIPWRECKS
Over the last 50 years most shipwrecks
have been found with the help of a magnetometer.
These super sensitive metal detectors, first used
in WWII to locate and track submarines, have become
one of the primary underwater search tools for
both the salvage industry and the scientific community.
Magnetometers or "mags" as they are
called, have been credited with finding thousands
of wrecks, worth hundreds of millions of dollars.
Mags work by sensing changes in the earth's magnetic
field. Any object made of iron or steel creates
a disturbance in the magnetic field. A mag can
detect a major disturbance, like the one created
by a steel wreck, at a distance of a quarter mile
or more. This makes it the ideal piece of equipment
to locate a steel wreck within a large search
area. Even wooden ships, like Spanish galleons,
have a "magnetic signature" created
by the cannons, anchors, chains, stoves, and other
iron objects carried on board. A mag is often
the only choice to find the remains of ships that
wrecked on shallow reefs hundreds of years ago.
Their timbers have disintegrated, and the cargo
is hidden under the sandy bottom or become encrusted
with coral now appearing to be part of the reef.
The powerful mag can detect the wreck's iron objects
regardless of the material covering it.
Today the Proton magnetometer is the workhorse
of any serious marine search operation. It's being
used by a diverse group including professional
treasure hunters, marine archeologists, commercial
diving companies, law enforcement agencies, and
military units. The proton mag is a rugged, reliable
instrument that is very easy to operate. In addition
to finding shipwrecks, mags are often employed
to locate pipelines, anchors, sunken automobiles,
weapons, and unexploded ordnance.
JW Fishers has specialized in the design and manufacture
of magnetometers for over 20 years. Currently
they produce two state-of-the-art mags, the Proton
4 boat-towed model and the Diver Mag 1, a hand-held
unit carried by a diver. Both mags have visual
and audio readouts. The Proton 4 features an easy-to-read
LCD display that is backlit for night operations
and an audio alarm to alert the operator when
a target is encountered. The Diver Mag 1 has an
LED display for easy underwater viewing and a
waterproof earphone that lets the diver know a
target is being detected. Both devices employ
a unique triaxial noise-cancelling sensor which
allows the mag to move in any direction without
heading error or dead zone. A software package
is available for the Proton 4 that allows the
mag readout data, the boat's GPS position, and
the track of the boat over the search area to
be displayed and stored on a laptop PC.
To receive a data sheet on Fishers
marine magnetometers or a color brochure on all
of their quality underwater search products, contact
Christopher Combs at JW Fishers Mfg. Inc., 1953
County St., East Taunton, MA 02718, USA. Phone:
(800) 822-4744 or (508) 822-7330. Fax: (508) 880-8949.
firstname.lastname@example.org or check out
the website at www.jwfishers.com.