Skinner designed a soundproof apparatus, often equipped with a lever or bar, with which he conducted his experiments in operant conditioning. this has been called a:

I believe the answer is: Skinner box.
Skinner box is a box design that often used by researchers to study animal behavior.
Skinner box consist of two important features:
- Food dispensers where researchers could give rewards for the subjects
- Electrical grid that could be used to impose punishment to the subject.