Signedunsigned
Inscribedwritten in white across top of rack: POS. #224
FunctionA standard relay rack with "power bars" for modular equipment.
Historical AttributesThe rack contains apparatus used by B. F. Skinner's laboratory at Harvard for his operant conditioning experiments.
The top banks of the rack contain examples of commercial and shop-built equipment developed in the 1960s and 1970s. These were used in Skinner's second and third types of set-ups. The lower two banks hold mostly shop-built apparatus used by Skinner in his set-ups in the late 1950s.