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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.

Tags: clock

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.

Tags: clock

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?

Tags: clock

By Marissa
Drag the corners of the quad to change the shape of the clock. Can you make the clock hands move counterclockwise?

Morph Clock
Is this clock a circle, or a square, or something in-between, or something beyond?  Not only do the hands move in this clock, but its shape changes with time.  At the hour it is circular, at the quarter hours it is square and at the half hour, it has gone beyond square to a concave curved square shape.  The morphing is achieved by taking a linear combination of the parametric representation of a square and a circle.

Tags: clock

Kaleidoscope Clock
Clock hands are colored triangles.  Seconds are counted by turning the kaleidoscope.

Tags: clock

Spline Clock
This clock is made from 4 pieces of parabola.  Drag the red 'control points' to change its shape.

Tags: parabola, spline, clock

Basic Clock
This basic clock app can be created in a minute or two with Geometry Expressions

Tags: clock

Nicomedes Conchoid Clock
This device is illustrated in Eustocius Commentaries on Archimedes (well.. not the clock part of it, I admit.)

Tags: clock, conchoid, nicomedes

hyperbolic clock with explanation
The hyperbolic clock is all about the parametrization.  Press the explain button to see why it moves the way it does.

Tags: hyperbola, clock