may 6, 1839 - Brass Instrument Psychological Test Era --} psychologist/psychiatrist use brass instrument to measure behavior * time measurement (chronoscope, chronograph, kymographs) * time production instruments (pendulums, gravity fall devices, clocwork makers, multiple interval timers) * response devices (Morse telegraphic key, lip keys, voice keys)
Added to timeline:
Date:
may 6, 1839
Now
~ 186 years ago