Pneumatic Recording Chronograph, by Richard
Pneumatic Recording Chronograph, by Richard
This is an instrument for recording onto paper, the exact times of certain events or phenomena that are being studied over a period of time.
This model was used for Astronomy, Physiology etc.
Photocopy of instructions included
MarqueChronographe Enregistreur pneumatique Richard
MarqueChronographe Enregistreur pneumatique Richard