MAJOR
COMPONENTS
OF
POLYGRAPH
INSTRUMENT
Pneumograph component
– This component occupies the two/upper pens of the instrument which
records the thoracic and abdominal breathing patterns of respiration. This
is accomplished through the use of a pneumograph consisting of two
hollow corrugated tubes about seven inches in length, each attached to a
unit by a rubber hose not longer than six feet and not larger than one
quarter inch in diameter. This breathing or pneumo unit is a low pressure
unit. The inhalation/exhalation of the subject causes the tubes to expand
and contract, thereby reflecting the change through billows to the pen into
the chart.
Pneumograph chest assembly Pneumograph abdominal
assembly
– this second unit simply attached to
– this unit is simply
abdomen of the subject. The function of
attached to the subject this is to record the changes of
breathing of the subject. The
chest. The function of this Pneumograph assembly is composed of
assembly is to record the the cord, volute tube and beaded chain.
The Pneumograph tube considerably in
changes of the subject diameter and the pneumograph
heartbeat. corrugated tube expanded and
contracts as the subject breaths.
Galvanograph
component
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