“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Mystic in New London County, Connecticut — The American Northeast (New England)

Compound Steam Engine

Compound Steam Engine Marker Photo, Click for full size
By Michael Herrick, August 26, 2013
1. Compound Steam Engine Marker
Compound Steam Engine
From Tugboat Socony 5
Horsepower: 850
Cylinders: 2
Bore: 19”, 40”
Stroke: 28”
Weight: 40,000 pounds
Length: 8’ 9”   Width: 6’ 10”   Height: 14’
This large steam engine was built in 1927 by the Staten Island Shipbuiding Company in Staten Island, NY. It turned a 10-foot-diameter propeller on the steel tugboat Socony 5, part of a New York Harbor tugboat fleet owned by Standard Oil Company of New York.
Developed about 1870, the two-cylinder engine was a practical power plant for small to medium-sized vessels for almost 80 years until superseded by diesel engines. This example worked with a steam pressure of 160 pounds per square inch. Steam from the boiler first entered the small high-pressure cylinder, driving its piston, and was then exhausted into the large low-pressure cylinder to expand further.
The engine’s horsepower of 850 may seem modest by today’s standards, but this figure is based on a working load output, unlike horsepower calculations for modern internal-combustion engines. This engine has 10 times the horsepower of the Paine compound engine of the Museum’s passenger steamboat Sabino.
ID# 1993.153
Location. 41° 21.571′ N, 71° 57.889′ 
Compound Steam Engine Photo, Click for full size
By Michael Herrick, August 26, 2013
2. Compound Steam Engine
W. Marker is in Mystic, Connecticut, in New London County. Marker can be reached from the intersection of Greenmanville Avenue (Connecticut Route 27) and Bruggeman Place, on the right when traveling south. Click for map. Located in Mystic Seaport. Marker is at or near this postal address: 75 Greenmanville Avenue, Mystic CT 06355, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Live Oak Log (a few steps from this marker); Wichmann Semi-Diesel Engine (a few steps from this marker); Lathrop D-90 Diesel Engine (within shouting distance of this marker); Propeller Steamer Sabino (about 300 feet away, measured in a direct line); Harbor Tugboat Kingston II (about 300 feet away); Eastern-Rig Dragger Roann (about 300 feet away); Whaleship Charles W. Morgan (about 300 feet away); Hays & Ros Clark Shiplift (about 300 feet away). Click for a list of all markers in Mystic.
Also see . . .  Mystic Seaport, The Museum of America and the Sea. (Submitted on September 15, 2013, by Michael Herrick of Southbury, Connecticut.)
Categories. Waterways & Vessels
Compound Steam Engine Photo, Click for full size
By Michael Herrick, August 26, 2013
3. Compound Steam Engine
Compound Steam Engine Photo, Click for full size
By Michael Herrick, August 26, 2013
4. Compound Steam Engine
Detail Photo on the Marker Photo, Click for full size
By Michael Herrick, August 26, 2013
5. Detail Photo on the Marker
The Tugboat Socony 5 Underway in New York Harbor
Model of Tugboat Socony 5 Photo, Click for full size
By Raymond Eckhoff
6. Model of Tugboat Socony 5
( courtesy of Auke Visser's Mobil Tankers & Tugs Site )

Credits. This page originally submitted on , by Michael Herrick of Southbury, Connecticut. This page has been viewed 417 times since then. Photos:   1, 2, 3, 4, 5. submitted on , by Michael Herrick of Southbury, Connecticut.   6. submitted on , by Michael Herrick of Southbury, Connecticut.
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