Category: Pulse
Estimated Date: 1905
Name: Mackenzie polygraph
Manufacturer: Mr. S. Shaw

Description: This is an early device to record physiologic functions. It consists of a 10“x 6“x 3.5” leather covered case with blue velvet lining and contains a complete polygraph including, motor-timer, 2 venous pulse, 1 arterial pulse, two pen mounts, extra paper with tracings, ink, extra pen mount. The motor measures 3.5“x 3“x 2 “and the pen mount on an arm 4.5” with 4.5” pens. Pens are activated pneumatically on ruber diaphragms. Tubing to connect pens to detectors is missing. A nice example of analog recording long before digital technology.

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