USS Emerald (SP-177)

The second USS Emerald (SP-177) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1918.

USS Emerald at anchor with laundry drying on her foremast rigging, ca. 1918.
History
United States
Name	USS Emerald
Namesake	The emerald, a green gem stone (previous name retained)
Builder	Pusey and Jones, Wilmington, Delaware
Completed	1906[1] or 1916[2]
Acquired	23 July 1917
Commissioned	Either commissioned 23 July 1917[3] or served in non-commissioned status[4]
In service	23 July 1917
Out of service	12 December 1918
Fate	Returned to owner
Notes	Operated as civilian yacht Emrose and Emerald 1916-1917 and as Emerald from 1918
General characteristics
Type	Patrol vessel
Tonnage	198 Gross register tons
Length	140 ft 4 in (42.77 m)
Beam	21 ft (6.4 m)
Draft	13 ft 3 in (4.04 m) aft
Installed power	900 indicated horsepower (1.2 megawatts)
Propulsion	Two Almy water-tube boilers, one triple expansion steam engine, one shaft
Complement	13

Emerald was built as the civilian yacht Emrose in either 1906[5] or 1916[6] by Pusey and Jones at Wilmington, Delaware for A. W. Rose of New York City. She later became the property of Maxwell Wyeth of Philadelphia, Pennsylvania, and was renamed Emerald.

The U.S. Navy acquired Emerald from Wyeth on 23 July 1917 for World War I service as a patrol vessel and placed her in service that day as USS Emerald (SP-177). Sources differ on whether she was commissioned[7] or served in non-commissioned status.[8]

For the rest of World War I, Emerald served in the 4th Naval District on harbor entrance patrol duty in Delaware Bay.

Emerald was taken out of service on 12 December 1918 and returned to Wyeth.