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.
Donated by Terry J. Ball, Ball & Gillespie Polygraph
Lafayette Polygraph
Model #76432-B
Donated by Steven Pederson, Waukesha County Sheriff’s Department
Lafayette Model #76056
Electro - Cardio Polygraph
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| 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.
Donated by Terry J. Ball, Polygraph Examiner
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.
Donated by Terry J. Ball, Ball & Gillespie Polygraph
Lafayette Mini-Graph
Model #761-061INK21
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.
Donated by Andrew Oakley. Port Orchard, Washington
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.
Donated by Terry J. Ball, Ball & Gillespie Polygraph
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.
Donated by Terry J. Ball, Ball & Gillespie Polygraph
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.
It was donated by Terry J. Ball, Ball & Gillespie Polygraph
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.
It was donated by Terry J. Ball, Ball & Gillespie Polygraph
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.
Donated by Terry J. Ball, Ball & Gillespie Polygraph
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.
Donated by Perry A. Lowe, Oregon Department of Corrections
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.
Donated by Alan Stein, Polygraph Examiner.
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.
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.
Donated by Terry J. Ball, Ball & Gillespie Polygraph
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.
