N.J. Stat. § 5:3-19: When licensed operator or booth not required

No licensed operator or booth shall be required in connection with the operation of any machine for exhibiting moving pictures which uses only an inclosed incandescent lamp, and only cellulose acetate or other slow-burning films of a size or perforation differing from the standard used in regular moving-picture theaters or similar establishments, providing such exhibition is approved by the municipal authorities having jurisdiction.