Antique Bakelite handle Baillart's Dynamometer cased. Wooden case with brass hardware and bordeaux velvet lined."Bailliart's Dynamometer gives intra-ocular pressure, when disc pressure causes retinal pulse to appear, diastolic pressure is read. Pressing until pulse disappeears gives systolic pressure" (description from Antique Medical Instruments, C. Keith Wilbur). Dated early 20th sec.