Signedunsigned
Inscribeda silver and blue sticker on front right side: LOCK UP
FunctionThis rack module contains two relays that are wired together. When the first is energized, the second keeps it closed (i.e. latched) until the current in the second relay is broken.
This was used to set up reinforcement for variable interval schemes.
Historical AttributesOne of many typical modular programming devices used in the late 1950s and early 1960's in B. F. Skinner's laboratory in the basement of Memorial Hall at Harvard University as part of his experiments on operant conditioning and behavioral psychology.
ProvenanceB. F. Skinner's laboratory, Memorial Hall, Department of Psychology, Harvard University.