Abstract
The design of the hydrophoragraph (water-wave-recorder), made primarily for recording the function of the human ureter, suggested its application for the registration of spinal fluid pressure and the outflow of spinal fluid in drops. Since, to my knowledge, there has heretofore been no device for recording spinal fluid pressure in ink, it was thought that the hydrophoragraph might be of further value for this purpose. The instrument is a combined water manometer and recording tambour, mounted on a movable and adjustable stand, and consists essentially of the following parts: A glass manometer with a scale in millimeters or centimeters of water pressure. For increased pressures a long glass manometer may be employed, or medium length glass tubes may be stacked on one another, as in the water manometer already in use. A tambour cup with rubber diaphragm the excursions of which are transmitted to the lever recording system. A lever

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