The archivist at the Commissioners for Irish Lights reports that he can find no information about Cormorant, even though she was in their service from 1878 to 1942. That is very disappointing. The only trace I have is a report that Cormorant replaced Petrel temporarily on the South Rock station in 1910, when Petrel was damaged in a collision. However, other records show that Petrel was not built until several years later! Moreover I can find no records on Google, or the National Archives (UK or Irish) of a South Rock lightship collision in 1910 - although several hundred references to the Nantucket disaster.
So where to next ....... ?