Parking meters shall be placed upon the sidewalk or curb immediately adjacent or next to each designated parking space, and in such manner as to show or display by a signal that the parking space controlled by such meter is or is not legally occupied. Each parking meter shall indicate by a proper legend the established legal parking time and, when in operation, shall also indicate on or by its dial or pointer the duration of the period of legal parking and, on the expiration of such period, shall indicate any illegal or overparking. (1944 Code Ch. 18 §60.)