Broom Bridge, Railway bridge in Cabra, Ireland
The stone bridge extends across the Royal Canal, connecting both sides of Broombridge Road in the northern part of Dublin through its solid architectural design.
Sir William Rowan Hamilton inscribed the quaternion multiplication formula i² = j² = k² = ijk = -1 on this bridge on October 16, 1843.
The bridge received its name from William Broome, a director of the Royal Canal company who lived in the surrounding neighborhood during the 1800s.
The structure functions as a connection point for travelers using the Dublin to Maynooth railway line, with platforms accessible from both sides.
Mathematicians from multiple countries gather at this bridge every October 16 for an annual walk from Dunsink Observatory to commemorate Hamilton's discovery.
Location: Cabra
GPS coordinates: 53.37300,-6.30000
Latest update: May 12, 2025 23:51
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