The question arises as to what particular kind of clock was at the bedside of Charles II that he should notice that it required winding. It may have been usual to wind it at that particular time every morning, being, as it undoubtedly was, a thirty-hour clock conveniently wound the same time every day. But it is more probable that the King saw that it wanted winding by the position of the weights. =Seventeenth-century Types.=--The idea of the pendulum had been in men's minds since the days of Leonardo da Vinci, but Christopher Huygens, the Dutch astronomer and mechanician, applied it to the clock. At first it was placed in front of the dial and swung from the top. The illustration we give (p. 51) shows an early clock with this device. The pendulum was next placed at the back (see adjacent illustration, p. 51), and later inside the clock. We illustrate several types of the lantern clock showing its changing form from a slender and graceful clock, with the dial in correct proportion, to the later type, when the dial projected beyond the body of the clock. When the bell was placed at the top and ornamented by a brass terminal, the name applied to the clock was "birdcage," and pictures by the old Dutch masters show birdcages of this shape hanging in ladies' boudoirs. It will be observed that as a rule the dials are circular, consisting of the hour plate without the four spandrels. But we illustrate an example of a square dial by John Bushman, London, about 1680, with crown and verge escapement, with short pendulum, and alarum with striking and going trains run by same weight. It will be observed that these clocks have only one hand--the hour hand. In the example above mentioned (see Frontispiece), the dial has an inner circle showing quarters of an hour. The hand, as illustrated, has passed one quarter and half of the next; it is therefore about twenty-two and a half minutes past three. There is also an alarum marked with arabic figures one to twelve. (An enlargement of this dial is illustrated p. 163) The other specimens we illustrate exhibit slightly varying characteristics. [Illustration: BRASS LANTERN CLOCK, WITH SINGLE HAND. Thirty hours; striking, but no alarum. With chains and weights beneath; short pendulum at back. Date, about 1660. Maker, Daniel Quare (London).] [Illustration: BRASS LANTERN CLOCK, WITH TWO HANDS. Thirty hours; striking and alarum. Anchor pendulum with wings each side and chains and weight below clock. Short pendulum at back. Date, about 1670.] [Illustration: BRASS LANTERN CLOCK. Showing chains with weights and long pendulum. Date, about 1700. (_At the Metropolitan Museum of Art, New York._)] The brass lantern clock illustrated (p. 55) has chains and weights. It is a thirty-hour clock, with striking but no alarum movement. It has a short pendulum behind the back plate.