In the case of the detectaphone transmitter, it only
replaces the regular telephone transmitter and its presence will
never be suspected. It operates just as well when the receiver is
hung up as when it is off the hook, as far as the purpose I have
in mind is concerned, as you shall see soon. I have put both forms
in so that even if they find the one back of the tires, even the
most suspicious person would not think that anything was contained
in the telephone itself. We are dealing with clever people and two
anchors to windward are better than one."
Dillon nodded approval, but by the look on his face it was evident
that he did not understand the whole thing yet.
"That other disc, back of the tires," went on Garrick, "is the
ordinary detective form. All that we need now is to find a place
to install this receiving box--all this stuff that is left over--
the two batteries, the earpieces. You see the whole thing is very
compact. I can get it down to six inches square and four inches
thick, or I can have it arranged with earpieces so that at least
six people can 'listen in' at once--forms that can be used in
detective work to meet all sorts of conditions.
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