12 h, jan 1, 1931 y - Ophthalmograph and Metronoscope Devices
Description:
Earl, James, and Carl Taylor created the Ophthalmograph and Metronoscope, devices used to record the movement of eyes while reading and tools that trained people to read more effectively.Added to timeline:
Date:
12 h, jan 1, 1931 y
Now
~ 95 years ago