Full time duty.
Section 23
SEC. 23. Full time duty.—Each city officer, except members of the Municipal Board, shall devote his time and attention exclusively during the usual office hours to the duties of his office, and such members shall attend the regular sessions of the Board. No city officer shall hold more than one office unless expressly so provided by law. But this section shall not apply to other persons discharging public duties in the city under the National Government who receive no compensation for their services.