Broom Bridge, also known as Brougham Bridge, is a bridge along Broombridge Road which crosses the Royal Canal in Cabra, Dublin, Ireland. Broom Bridge is named after William Brougham, one of the directors of the Royal Canal company. It is somewhat famous for being the location where Sir William Rowan Hamilton first wrote down the fundamental formula for quaternions on October 16, 1843, which is to this day commemorated by a stone plaque on the northwest corner of the underside of the bridge.
The text on the plaque reads:
- Here as he walked by
- on the 16th of October 1843
- Sir William Rowan Hamilton
- in a flash of genius discovered
- the fundamental formula for
- quaternion multiplication
- i² = j² = k² = ijk = −1
- & cut it on a stone of this bridge.
Given the historical importance of the bridge with respect to mathematics, mathematicians from all over the world have been known to take part in the annual commemorative walk from Dunsink Observatory to the site. Attendees have included Nobel Prize winners Murray Gell-Mann, Steven Weinberg and Frank Wilczek, and mathematicians Sir Andrew Wiles and Ingrid Daubechies.
- "NUI Maynooth - Mathematics Department - Hamilton Walk Information". Retrieved 2008-10-16.
Further reading 
- Irelands Royal Canal, Ruth Delany, ISBN 0-946640-92-0
- John C. Baez, Directions, photos and discussion, at University of California at Riverside
- Broom Bridge at Structurae