Photo date: Sept. 18, 1894.
Possibly New York Yacht Club.
Photo date: June 14, 1892.
Photo Date: Oct. 3, 1899.
Although there were five versions of Shamrock (numbered I through V), Johnston only lived long enough to photograph the first Shamrock, now referred to as Shamrock I. Indeed, it was during the 1899 America's Cup race between Shamrock and Columbia that Johnston reportedly caught the cold which led to his death.
(Note that there was another yacht named Shamrock - according to the August 1896 issue of Outing magazine, there was a Shamrock owned by W. P. Ward. Does anyone know anything about this vessel?)
Shamrock was the unsuccessful Irish challenger for the 10th America's Cup in 1899 to the US defender, Columbia. Shamrock was designed by William Fife III, Jr. and built in 1898 by Builder: J. Thorneycroft & Co, at Millwall on the Thames near London, England for owner Sir Thomas Lipton (of Lipton Tea Fame).
According to Americascup.com :
"Shamrock I is launched on June 24, 1899 and christened by Lady Russell of Killowen. Its build has been shrouded by secrecy and its hull is hidden by canvas, as was the case for Thistle, in 1887. The 1895 challenger Valkyrie III is refitted to be sailed as a trial horse for Shamrock I. Soon after its launch, Shamrock I races against the Prince of Wales' yacht, Britannia. The Irish challenger outpaces the royal yacht in two regattas on the Solent. Shamrock I arrives in New York on August 18, 1899, and sails daily to train the crew for the Cup races.
"During the second [cup] race, on the first windward leg, Shamrock's topmast snaps and the challenger withdraws. The same evening a new spar is fitted. The Irishmen add four tonnes of ballast, so the yacht is re-measured on October 18, but its sailing performance is not improved. The Irish yacht's Steel mast is too bendy. During the 1899 yachting season, the boat goes through six sets of sails.
"On November 2, 1899, Shamrock I leaves New York and is towed back to Great Britain by Lipton's steam yacht, Erin, via the Azores. It is dry-docked on arrival. [In] 1901 Shamrock I is refitted by Lipton and sails as a trial horse for his new challenger, Shamrock II, a George L. Watson design. [In April] 1903, Shamrock I is refitted again and sails as a trial horse for Shamrock III. On May 28, 1903, with 41 crewmen onboard, Shamrock I sails to New York and races against Shamrock III before the Cup. After the Cup, Lipton tries to sell his two yachts, without success. [In] 1914 Shamrock I sails against Shamrock IV off Cowes before Lipton's fourth challenger sails across the Atlantic.
"Yacht club: Royal Ulster Yacht Club, Ireland
Sailmaker: Ratsey, Cowes
Skipper: Captain Archibald "Archie" Hogarth and his assistant, Captain Robert "Bob" Wringe
Afterguard: Jesse Connell and Captain Ben Parker "
For more information, see http://www.americascup.com/en/acclopaedia/circlinggalaxy/bateau.php?idContent=4704.