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Yet just that slight little current is enough to sway the
gossamer strand of quartz fibre up there at what we call the
'heart station.' So fine is this machine that the pulse-tracings
produced by the sphygmograph, which I have used in other cases up
to this time, are clumsy and inexact."
Again he paused as if to let the fear of discovery sink deep into
the minds of all of us.
"This current, as I have said, passes from each one of you in turn
over a wire and vibrates a fine quartz fibre up there in unison
with each heart here. It is one of the most delicate bits of
mechanism ever made, beside which the hairspring of a watch is
coarse. Each of you in turn, is being subjected to this test. More
than that, the record up there shows not only the beats of the
heart but the successive waves of emotion that vary the form of
those beats. Every normal individual gives what we call an
'electro-cardiogram,' which follows a certain type. The
photographic film on which this is being recorded is ruled so that
at the heart station Dr.


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