This image shows the Mackay mansion's great hall with its Venetian lantern and the entryway's green Connemara columns with white marble bases and capitals.
The caption accompanying this image reads as follows:
1902
The lantern can be seen hanging in three other images of the great hall placed here in the Library, the first seen here, the second seen here, and the third seen here.
See Harbor Hill, Clarence Hungerford Mackay's Mansion.