Handbell Ringing

Ringing the changes

Ringing Js refinements

Both the four-point and the uniform cubic B-spline refinement (i.e. subdivision) schemes double the number of vertices of a closed-loop polygonal curve P and respectively produce sequences of vertices fk and bk. The Js refinement proposed here produces vertices vk=(1–s)fk+sbk. Iterative applications of Js yield a family of curves parameterized by s. It includes the four-point curve (J0), the un...

Listening for Ringing Black Holes

The gravitational radiation produced by binary black holes during their inspiral, merger, and ringdown phases is a promising candidate for detection by the first or second generation of kilometer-scale interferometric gravitational wave antennas. Waveforms for the last phase, the quasinormal ringing, are well understood. I discuss the feasibility of detection of the quasinormal ringing of a bla...

The emergence of ringing vertigo.

Ding dongmerrily on high, goes the famous Christmas carol, but for some of the United Kingdom’s 40 000 campanologists the bells have not been ringing so merrily. Instead, church bell ringers have this year been complaining of a disorder that has been forcing them to abandon their towers and steeples and seek out hypnotherapists and counsellors in search of a cure. Symptoms include vertigo, a se...

The Ringing of Euler’s Disk

The motion of disks spun on tables has the well-known feature that the associated acoustic signal increases in frequency as the motion tends towards its abrupt halt. Recently, a commercial toy, known as Euler’s disk, was designed to maximize the time before this abrupt ending. In this paper, we present and simulate a rigid body model for Euler’s disk. Based on the nature of the contact force be...