Broom Bridge, Dublin

4.2
Broom Bridge, also called Broome Bridge, and sometimes Brougham Bridge, is a bridge along Broombridge Road which crosses the Royal Canal in Cabra, Dublin, Ireland. Broome Bridge is named after William Broome, one of the directors of the Royal Canal company who lived nearby. It is 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. After being spoiled by the action of vandals and some visitors, the plaque was moved to a different place, higher, under the railing of the bridge.The text on the plaque reads:Here as he walked byon the 16th of October 1843Sir William Rowan Hamiltonin a flash of genius discoveredthe fundamental formula forquaternion multiplicationi² = 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, Sir Roger Penrose and Ingrid Daubechies. The 16 October is sometimes referred to as Broomsday and as a nod to the literary commemorations on 16 June .
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Broom Bridge Reviews
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TripAdvisor Traveler Rating 4.5
2 reviews
Google
4.4
TripAdvisor
  • Not that I am into equations, like a previous reviewer, over the many years I have lived in this fine city I have been across this bridge over and over, it always fascinated me with it's steepness, an...  more »
  • This bridge is fundamental to the historic story of the mathematical system for describing space using quaternions. You've had the benefit of this simple mathematical equation if you've ever played a ...  more »
Google
  • I'm afraid I can't say much about it as I wasn't there for long but what I saw was nice, quite & peaceful, so till I go back again I can only give it 3 to be fair
  • This is a historical post, especially for the engineering culture: in this place Sir William Rowan Hamilton wrote the formula of the quaternion. The place is not well maintained, although it is in the suburbs: no signs (the plaque is a little ' hidden), river covered with seaweed and rubbish, but I recommend it equally to those who are interested.
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