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16 Oct

Quaternion Bridge

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The quaternion plaque on Broombridge © Cliff Bilbrey on Flickr (CC BY-NC 2.0)

The quaternion plaque on Broombridge
© Cliff Bilbrey on Flickr (CC BY-NC 2.0)

This plaque commemorates the discovery of the quaternion formula (i2=j2=k2=ijk=-1) by Sir William Rowan Hamilton on 16th October 1843, as he walked along the canal from Dunsink on his way to a meeting in Dublin. Without paper to hand he scratched the formula into one of the bridge’s stones.

There is a commemorative Hamilton Walk organised by the Maynooth University Maths department every year. There is also a virtual version here.

For a Storify of Hamilton Day 2015 and the 25th Hamilton Walk, click here.

One thought on “Quaternion Bridge

  1. Pingback: What has Hamilton to do with philosophy? | Irish Philosophy

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