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 16 October 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.

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.[3] The 16 October is sometimes referred to as Broomsday (in reference to Broome Bridge) and as a nod to the literary commemorations on 16 June (Bloomsday in honour of James Joyce).

Reillys Bridge is a Single-arch humpbacked limestone canal bridge, dated 1792, carrying Ratoath Road on north-south axis over Royal Canal. There is a Carved Portland limestone plaque set into both parapets with oval panels inscribed '1792 H.S Reilly Bridge & Lock'. Located adjacent to 8th Lock.

Recently I obtained a Sigma DP3 Quattro but as I have its older brother, the Sigma DP3 Merrill,  I decided to give it a try today because it was very sunny. The Sigma cameras do not perform well in low light and reality it is not possible to use above ISO 100.

The Merrill is a nightmare to use as it has no viewfinder and the display uses so much power that the batteries that I have allow at best 40-50 images and on a hot day not even that many. I has 5 batteries and managed 160 photographs before the last one declared that it was exhausted. It also freezes on a regular basis.