# Search Results for “Clock”

##### Paucelliers Clock

Paucellier won a competition with this mechanism which creates exact straight line motion. We have used this to drive our linear clock, resetting to the left each time a hand reaches 12 o'clock. The middle is 6 o'clock. While Paucellier's linkage is a novelty, approximate straight line mechanisms such as Watt?s Linkage are used in automobile suspensions.##### Elliptical Clock

An elliptical clock, where hand movement is such that it looks like a tilted circular clock. Notice that the hands move round the ellipse faster when they are vertical and slower when they are horizontal. This mimics exactly the apparent movement of hands if you were looking at a tilted circular clock. The precise way a point moves round a curve is called a parametrization of the curve. Pressing the**Explain**button shows you how this parametrization is obtained.

##### Hyperbolic Clock

The hands on this clock follow a parametrization of the hyperbola. There is a logic to the way the hands move. Press the**Explain**button to see how this parametrization is obtained from a circle. No matter how clever the parametrization, you cannot get around the fact that the hyperbola goes off to infinity and back. At 12 o'clock and 6 o'clock, the hands jump from one branch of the hyperbola to the other. Can you relate this parametrization to that of the ellipse?