As indicated by the caption, this undated image shows the club room that overlooked Mackay's tennis court. Obviously, the word "sluplementing" is a typographical error that should be "supplementing" instead.
The caption accompanying this photograph reads as follows:
The club room, sluplementing [sic] regulation galleries, it also overlooked Mackay's tennis court
See Harbor Hill, Clarence Hungerford Mackay's Mansion.
