Ranschburg Memory Device 

maker, source: Zimmermann, Liepzig
year made, acquired: c. 1920

The Ranschburg Memory Device presents a series of visual stimuli successively, at a specified rate, to be memorized. Symbols, letters, numbers are written on the white disk, and temporarily revealed through the exposure slot. The Disk is driven in discreet steps by an internal motor.

Ranschburg invented this apparatus based on the work of Herman Ebbinghaus, the pioneer memory researcher. At Toronto, it was used primarily in the teaching laboratory.

(Source: None given.)
Source of illustration: Zimmermann, E. (1903). XVIII. Preis- Liste über psychologische und physiologische Apparate (p. 14). Leipzig: Eduard Zimmermann.

DESCRIPTORS:
Type: research
Stimulus: syllables, words
System: memory, vision
Output: number of trials