Early Lafayette Polygraph
Model #7603-2
This particular instrument is a four channel, all mechanical,
polygraph. It features one pneumograph, two galvanometers, and one cardiograph. It was enclosed in a light mahogony case with
white bakelite finish. The presence of two galvanometers is very unusual.
The cardiograph featured a readout
dial that was installed directly into the module itself, rather than being installed on the left side of the instrument. It
also came with a mahogany case to hold accessories and module attachments.
$300, plus shipping
and handling.
Lafayette Polygraph
Model #76432-B
$350, plus shipping
and handling.
Lafayette Model #76056
Electro - Cardio Polygraph
|
| Lafayette Model 76056 |
The Lafayette Model 76056 displayed here was first introduced
by Lafayette Instrument Company of Lafayette, Indiana in 1972. The 76056 was considered to be the most popular instrument
introduced at the time, with double pneumographs, G.S.R., Electro-Cardio, and a top-mounted pnuematic stimulus marker. The
mechanical pneumos featured stainless steel shafts with a sapphire olive ring, and bombe jewel bearings for increased sensitivity.
The solid state G.S.R. on the Model 76056 is linear from 1 to 1,000,000 ohms in automatic or manual mode. The newly designed
pens had a increased sweep of 5.75 inches. The newly designed electro-cardio provided quality records at low cuff pressure.
This instrument also incorporated a precision friction paper drive, pen lifter bar and paper well which permitted easy chart
replacement.
Lafayette Instrument Company boasted that
their Model 76056 was very modular, which allowed for easy field replacement components. This polygraph instrument was lightweight,
and enclosed in a sturdy Haliburton case, which also had in the case accessory storage. The Model 76056 was priced at $2148.00 dollars, and was available with an optional carrying case for $28.00 dollars.
This instrument was used in Texas until early in 1981.
This instrument is not
in The Polygraph Museum's collection. Narrative and photograph courtesy of Ron Decker.
Lafayette Polygraph
Model #76057
The Model 76057 was introduced in the early 1960's. It
was equipped with Lafayette’s patented “Electro-Cardio” channel. It was also the first polygraph instrument
to include an ohmmeter on the galvanograph to give exact reading of resistance. It is believed that the readings on
the ohmmeter could indicate the absence or presence of drugs in the examinee.
It came equipped with two pneumographs,
one cardiograph, and one galvanograph channel, housed in a metal case equipped with an eight inch kymograph.
$350,
plus shipping and handling.
Lafayette
Model #761-76X
This instrument is a four channel, all mechancial polygraph
with two pneumographs, one galvanometer, and one cardiograph. The cardiograph is selectable between a cardiograph and a pneumograph.
It is housed in a black brief case for easy portability, and has a stainless steel face plate.
It is also equipped with an eight
inch kymograph.
$400, plus shipping
and handling.
Lafayette Mini-Graph
Model #761-061INK21
$350, plus shipping and handling
Lafayette Pentograph
Model # 760-560
Manufactured in 1980, this Lafayette Instrument featured two
manual pneumographic modules, a GSR module, and one manual cardiographic module. It was later upgraded with an electronic
cardiographic module.
It features many of the refinements of the next generation of polygraph
instruments. With little if any change to the instrument itself, Pentograph owners were able to take advantage of later
refinements in Lafayette Instruments due to interchangeability of the Lafayette Instrument’s design.
$300, plus shipping
and handling
Lafayette Diplomat
1
Model #761-76LE
The Diplomat Series is the "briefcase" version of
Lafayette's instruments. Housed in a small brief case, it was easily carried by examiners on-the-go. This particular Diplomat
is a four channel, all mechanical instrument, featuring two pneumographs, one galvanometer and one cardiograph. It could be
modified to hold one more module.
In it's lid is a calibration unit that examiners could use to
calibrate each module before use. It is also equipped with n eight inch kymograph.
$350,
plus shipping and handling.
The Argenbright II
Lafayette Model #761-76G
The Argenbright II was housed in a brief case for easy portability.
It was manufactured by the Lafayette Instrument Company specifically for the Argenbright Polygrah School graduates in Florida.
This particular instrument is a four channel, all mechancial instrument, consisting of two pneumographs, one galvanometer,
and one cardiograph. It it's lid is a calibration unit.
$400,
plus shipping and handling.
Lafayette Ambassador
Model #: 760-58G
The Ambassador Series of Lafayette polygraphs came after the
Pentograph Series. This particular instrument is a five channel all mechancial polygraph with two pneumographs, one galvanometer,
one cardiograph, and one stimulus marker.
$350, plus shipping and handling
Lafayette Ambassador
Model #: 761-65GA
This particular instrument is a five channel all electronic
polygraph. It has two pneumographs, one galvanometer, one cardiograph, and optional module which was user selectable for either
cardiograph, galvanometer, or pneumograph.
This model does not use any ink. It is a thermal model. The
tips of the pens are heated by the instrument and leave tracing on special thermal paper.
$400, plus
shipping and handling
Lafayette Factfinder
Model #761-95GA
Manufactured in 1985, this Lafayette Instrument represented
the top of the line for the Lafayette Instrument Company. It features five fully electronic modules, plus an electronic stimulus
marker. In it’s lid was a Polygraph Calibration Unit. This unit did support additional sensors, including motion sensors,
CAMS and a Thumb Transducer. A unique feature of this instrument was the dual sphygmomanometers, allowing an examiner to run
dual cardio tracings.
It was used as the primary polygraph instrument by Terry J. Ball of Ball
& Gillespie Polygraph between 1985 and 1995. During this time approximately 5000 polygraph examinations were
conducted with this instrument.
$500, plus shipping and handling
Lafayette Factfinder
Model #762-96GA
Manufactured in 1987, this Lafayette Instrument represents the
top of the line for Lafayette instruments. It features five all electronic modules, plus an electronic stimulus marker. Two
pneumographs, one galvanometer, and two cardiographs.
It was used as the primary polygraph instrument by the Internal Affairs Investigations Division of the Oregon Department
of Corrections for ten years.
This instrument for sale for $700, plus shipping and handling
We
accept all major credit cards
See "Buying an Instrument'
for details on buying our instrument.
Lafayette Heart Rate Monitor
Model #:77068
Designed as an attachment for Lafayette Diplomat and Factfinder
series, this small instrument allowed the examiner to monitor heart rate acitivty during a polygraph examination.
The Heart Rate Monitor, when used in conjunction with any
electronic multiple function amplifier, is designed to be used as an independent monitoring device that produces a permanent
recording of increases and decreases in the subject’s heart rate. An LED light flashes synchronously with each beat
of the heart. A 5 beat-per-minute calibration push button is provided and also serves as a battery test button during operation.
A mode selector is available for recording either beat-to-beat or average heart rate. A 9V battery is included.
$75,
plus shipping and handling
Lafayette PLE Coupler
Model #:76599
The PLE (Plethysmograph) Coupler
is designed for use with any electronic multiple function amplifier to give the examiner the option to select the time constant
which provides the most useful recording with each subject. A total of four capacitively coupled (AC) modes are available
with time constants of 0.1, 0.5, 1.0 and 5.0 seconds. A (DC) mode is also available with controls for balance and trace restore.
$75,
plus shipping and handling
Lafayette
Power Pack
Model #: 76754
This device is an external power pack for Lafayette instruments.
It has a re-chargeable battery which was capable of supplying power to a polygraph instrument for approximately four hours.
It took up to sixteen hours to receive a full charge. It is encased in a mahogany case. Very rare accessory.
$100,plus shipping
and handling
Psychogalvanometer
Model
#77011
This was a single channel recorder. It was designed primarily as a GSR unit with marker pen. However, since a
standard 76400 Amplifier is incorporated it is easily used for recording pulse rate, respiration, skin temperature, photoelectric
plethysmography, mypgraphy, or EKG and EEG when appropriate pre-amplifiers are added to the unit. The entire system is housed
in a completely portable wooden cabinet and weighs only 14 pounds.
$75,
plus shipping and handling
