As indicated by the caption, this image shows the Venetian lantern that hung in the Mackay mansion's great hall.
The caption accompanying this image reads as follows:
Harbor Hill's prized pierced and repousse brass Venetian lantern. Soon enough, the time would come for its banishment.
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.