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The Aachen 40 mine detector is a heterodyne type very similar to the
Neptun mine de-tector (par. 128). Because of the similarity, the Aachen
40 is believed to be an improvi-sed model of the Neptun. The extension
handle is in three pieces, making this detector more easily carried than
the Neptun. The uppermost extension piece has a housing for a tuning
condenser. Like the Neptun mine detector, the search head is in the form
of a cir-cular ring with a square cross-section. The detector unit and
the battery are contained in an aluminum case. The Aachen 40 mine detector
is superior in sensitivity to the Nep-tun and it also has a louder, more
stable signal.
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