In addition to the improved accuracy due to isochronism, lower air drag meant they needed less power to keep swinging, and caused less wear on the clock's movement.
They needed less power. This was to keep swinging. This was what lower air drag meant in addition to the improved accuracy due to isochronism. They caused less wear on the clock's movement. This was what lower air drag meant in addition to the improved accuracy due to isochronism.