Category Archives: Engineering and construction

Triangular quaternions

The indefatigable Mary Mulvihill has produced a podcast guide to a Royal Canal walk, from Dunsink to Broombridge. The podcast is free to download as an MP3 file.

Its production was supported by Maths Week Ireland and the Irish Research Council for Science, Engineering & Technology (IRCSET); it follows the annual walk to commemorate the achievement of Sir William Rowan Hamilton, who in 1843 invented a new type of algebra, quaternions, and wrote the equation on the bridge.

bjg

The Suir

South Tipperary County Council participated in the EU Waterways Forward project, with a focus on the River Suir. Here is a brief report on the Suir River Café project.

The other Irish participant was Waterways Ireland, whose project (PDF) was about the implementation of the Water Framework Directive on canals.

The far end of the Shannon

Apologies to folk who have left Comments or otherwise communicated in recent weeks: I’ve been away, most recently at the far end of the Shannon and at Greenwich. I am now beginning to tackle my correspondence.

De Wadden

De Wadden formerly traded to the (Munster) Blackwater and is now displayed in a dry dock at Liverpool. I knew she was there, but I hadn’t known that the Kathleen & May, now on sale, was there too.

Kathleen & May

In Greenwich, I saw a bust of George Biddell Airy, late Astronomer Royal, whose work on the tides of the Shannon Estuary is of such great interest.

George Biddell Airy

 

Grand Canal Harbour maltings: a protected structure

I see on this website that the curved building at Grand Canal Harbour in Dublin, is a protected structure.

Here is the roof in 2007:

The roof in 2007

Here is the roof in October 2011:

The roof in October 2011

I have asked the developers for their comments.

 

The Broadstone

On a quick visit to Dublin, I managed to get a carless photo of the Broadstone MGWR station building.

The Broadstone building

 

Shannon estuary: Aughinish

The Irish Times reports that Rusal, current owners of the Aughinish Alumina plant, want to increase production. See the plant and its “waste storage facility” here (satellite view on a larger map is best):

Glorious Galway

Book by Meitheal Mara being launched on 20 October 2011:

Galway possesses an immensely rich heritage of boats, beyond compare on the island of Ireland and significant in the wider European context. This book covers not only the well-known craft, the Curachs and Galway Hookers but also the lesser-known ones: the wooden angling boats of Lough Corrib; the ubiquitous Curach Adhmaid; the fishing boats – Lobster Boats, Trawlers and Half-Deckers; the Barges and Hire-cruisers of the Shannon; the Flats, Yawls and Curachs of the oyster fishery; the clinker punts and cots of the Shannon callows, and many more.

Link to PDF.

The book can be bought from the Meitheal Mara website.

This site has no commercial interest in the matter but I am happy to draw attention to books on aspects of Ireland’s waterways history and heritage.

 

 

Two more sisters

Members of the Heritage Boat Association have, in recent weeks, visited Piltown (Co Kilkenny) and Portlaw (Co Waterford) by barge, the first time in many years that large vessels have been up those rivers.

Many of the published accounts of Portlaw, including the Heritage Council’s Heritage Conservation Plan, pay inadequate attention to the navigation of the Clodiagh; it may have been even richer than we thought.

The HBA has a press release about some significant finds at Portlaw.

The owners of the barge Hawthorn joined other boats for the trips and wrote about them here:

Here is the relevant section of the OSI map for Portlaw (choose one of the Historic options). Here is where the Pil joins the Suir (zoomed out).

Here is my own article (in need of updating) about Portlaw and the Clodiagh.

Incidentally, I contend that the OSI maps are wrong in describing the gates on the canal as flood gates: they would open to, rather than close against, an incoming flood, and would prevent the discharge of an outgoing flood.

 

Optimists …

… in Clones.

Love me tender

Waterways Ireland tender documents are a source of interesting and occasionally useful information. At present WI is looking for tenders for

  • a hospitality guide
  • turf (sod peat) for bank repairs on the Royal Canal
  • automation of certain weirs. Expressing an interest in this one will allow you to get some original (Shannon Commissioners) drawings of parts of the  old weirs.