The introduction of the dead-beat escapement enabled the seconds hand of a longcase clock to advance without the slight recoil which is evident with the anchor escapement. This permitted a much longer second hand, known as a sweep or centre second, which had a 'tail' or counterbalance and extended in length as far as the minute band near the outer edge of the chapter ring. The minute divisions then represented seconds as well, the sweep second completing its full revolution in one minute. Sweep centre seconds were occasionally used for clocks fitted with chronometer-type detent escapements, and they are now common on synchronous electric clocks, on which they move in a steady progression.