Long, large enough to permit the passage of the largest battleship; the channel was bridged in 1887 by an iron swivel bridge, which when open leaves a passage way 196 ft.
Into the square axial hole fits the square end of a hooked iron bar which projects several yards beyond the mouth of the furnace; by means of this bar a workman moves the fireclay cylinder about in the glass with a steady circular sweep. Although the weight of the iron bar is carried by a support, such as an overhead chain or a swivel roller, this operation is very laborious and trying, more especially during the earlier stages when the heat radiated from the open mouth of the crucible is intense.
Between this and North Wall the river is crossed by twelve bridges, which, in order from west to east, are these: - Sarah Bridge, the bridge of the North Wall extension railway; King's, commemorating a visit of George IV.; Victoria or Barrack; Queen's; Whitworth, of interest as occupying the site where a bridge has stood since the 12th century; Richmond, Grattan and Wellington; O'Connell, Butt and a swivel bridge carrying a loop railway.
After reposing some time, the clear juice is carefully decanted by means of a pipe fixed by a swivel joint to an outlet in the bottom of the tank, the upper end of the pipe being always kept at the surface of the liquor by a float attached to it.
The Congested Districts Board, however, have made efforts to improve the condition of the people, and a branch of the Midland Great Western railway to Achill Sound, together with a swivel bridge across the sound, improved communications and make for prosperity.
In another the mould-board and share are shaped so that they can be swung on a swivel under the beam when the latter is lifted.