Jasco electronic sphygmomanometer, model J-108, mk II, plastic and metal, made by Japan Standard Corp., Saitama, Japan, 1977

A sphygmomanometer measures blood pressure. To do so, a rubber cuff was inflated above the elbow to block the pulse in the lower arm. In modern sphygmomanometers, the cuff is pumped up and the pulse listened to with a stethoscope until the sound disappears. The technique was described by N. S. Korotkov (1874-1920) in 1905. This instrument is the model J-108, mk II. It was made by the Japan Standard Corporation. With this device, the disappearance of the pulse is detected electronically and registered by an audible signal.

binaural stethoscope

Broadsheet, paper, describing Jasco, model J-108 mk II

Jasco heartscope with electric transducer, plastic and metal, made byJapan Standard Corp., Japanese, 1977

Case for Jasco heartscope, made by Japan Standard Corp., Japanese, 1977