An old double-walled gooseneck street light illuminated the roadway in front of these vintage homes. Note the "break-arm" on the pole's crossarm. A wire from each end of this community's street lighting circuit dead-ended on each side of this cast-iron break arm. From there a wire on each side led down to the street lamp fixture. This very economical method was known as series street lighting. It was commonplace with incandescent street lights for many years and is still employed in many LA Basin municipally owned communities. The basic principle of operation was so that if any of the fixtures' lightbulbs failed for any reason the remainder would stay lit. Much like strings strings of series-type Christmas lights. This method was very efficient because the lower-voltage (higher current) lamps employed were more energy efficient than their 120 volt counterparts and that only one wire was required to maintain such street series lighting loops. Voltage regulation (adjusting for any lightbulb failres) for the entire loop was maintained at a master location, along with constant current regulation (typically 6.6 amperes) along with a photoelectric control that turned the whole system on at dusk and off at dawn.