Category: Sphygmograph
Estimated Date: 1915
Name: Portable Polygraph
Manufacturer: G. Boulitte

Description: Capsule Oscillograph of Pachon. Wooden case 9.25“x 9“x 7” with complete set. The recorder with paper roll attached, clockwork advance mechanism, 3 recorders, one elaborate box like, two simple tambours, all three with pens to record on device key, extra pens, two sensors, one venous, the second arterial. Handwritten instructions with old address.

Reference 1: 46