A caisson is launched - presumably to mark the start of construction work on Dublin docks.
Item title reads: "Preparing for new era. Dublin port and docks board and Provisional Government officials attend launch of great "Caisson".
Dublin, Eire, Southern Ireland, Republic of Ireland.
M/S of large wooden device being launched - a wooden "caisson" which is a device used to carry out construction work underwater.
Panning shot of the government officials attending the opening ceremony. C/U of Irish official not recognised by this cataloguer.
Note: names of officials not listed in paperwork. Presumably the launch of this strange wooden contraption marks the start of construction work on Dublin docks.