So called because of its frame's resemblance to a lantern. Other names have been used, including Cromwellian and bedpost clock, the former because the bell at the top suggested a Cromwellian helmet and the latter because of the four turned columns at each corner of the frame. The lantern clock was developed in England with similar versions in other countries, during the 17th century, and superceded the wrought-iron wall clock. Originally it was designed to hang from a hook on the wall and early specimens still retain their iron hook rings and distance spurs. The spurs were fitted into the rear pendant 'feet' to permit the clock to hang vertically and to alow space for the pendulum, which was adapted to lantern clocks by Ahasuerus Fromanteel I just before 1660. Previously, a large wrought-iron balance was the only form of escapement employed, and it was notoriously inaccurate. Verge escapements with short bob pendulums were used for lantern-clock movements until well into the 18th century, but with the introduction of the long 'royal' pendulum with a one-second beat, many conversions were carried out. About the time of these conversions lantern clocks were often arranged to stand on wooden wall brackets. With only a few exceptions, the lantern clock was fitted with one hand, but sometimes there was also an alarm mechanism.