Engineering, Building, and Architecture

Not many museums collect houses. The National Museum of American History has four, as well as two outbuildings, 11 rooms, an elevator, many building components, and some architectural elements from the White House. Drafting manuals are supplemented by many prints of buildings and other architectural subjects. The breadth of the museum's collections adds some surprising objects to these holdings, such as fans, purses, handkerchiefs, T-shirts, and other objects bearing images of buildings.

The engineering artifacts document the history of civil and mechanical engineering in the United States. So far, the Museum has declined to collect dams, skyscrapers, and bridges, but these and other important engineering achievements are preserved through blueprints, drawings, models, photographs, sketches, paintings, technical reports, and field notes.

By 1943, the outlook for an Allied victory in World War II was steadily improving. The reign of the U-boats that had plagued Allied convoys in the Battle of the Atlantic was coming to an end.
Description
By 1943, the outlook for an Allied victory in World War II was steadily improving. The reign of the U-boats that had plagued Allied convoys in the Battle of the Atlantic was coming to an end. And the Axis powers were finally losing the tonnage war, which aimed to sink Allied merchant ships faster than replacements could be built. While the mass-produced Liberty ships were faithfully carrying cargo and troops to war zones, these ships were relatively slow. In response, the War Shipping Administration commissioned a new class of emergency vessels called Victory ships. This model represents one of the 534 Victory ships that were built alongside the Liberty ships in seven shipyards around the country.
Speed was the key difference between the Victory and Liberty ships. When Liberty ships were designed, all of the new steam turbine engines were reserved for naval vessels, leaving the Liberty ships with reciprocating steam engines. While these engines were reliable, the ships could only reach 11 knots, leaving them vulnerable to attack. As the war progressed, more turbine engines became available and were installed in the Victory ships, giving them a speed of over 16 knots.
Another improvement of the Victory design was a stronger and larger hull. This meant that more cargo could be transported at once, and improved the odds of the vessels continuing to serve in the merchant fleet during times of peace. After World War II, 170 Victory ships were sold as commercial freighters. About 20 were loaned back to the military and used in the Korean and Vietnam Wars. Several Victory ships have been preserved as museum ships and are currently located in California and Florida.
date made
early 1940s
commissioned Victory ships like the ones this model represents
War Shipping Administration
ID Number
TR.313023
catalog number
TR*313023
accession number
170015
Although dry cargo freighters like the Liberty and Victory ships are probably the best-known emergency vessels of World War II, oil tankers were also mass produced in American shipyards and played an important role in the Allied victory.
Description
Although dry cargo freighters like the Liberty and Victory ships are probably the best-known emergency vessels of World War II, oil tankers were also mass produced in American shipyards and played an important role in the Allied victory. This model represents the most common type of tanker, T2-SE-A1, a commercial design that before the war started was already being constructed by the Sun Shipbuilding Company for Standard Oil. After the attack on Pearl Harbor, the United States Maritime Commission recognized that wet cargo like oil and machine lubricants would be just as necessary as guns and ammunition. The commission ordered this design to be built, in addition to the dry cargo designs.
Like the Victory ship, the T2 tanker was outfitted with a steam turbine engine that gave the vessel a speed of over 14 knots. Tankers were also built at some of the same shipyards as the other merchant vessels, and experienced a similar construction time average of about 70 days. But unlike the Victory or Liberty ships, no T2 tankers have survived to become museum ships, and only one remains afloat in the National Defense Reserve Fleet, mothballed in Beaumont, Texas.
date made
early 1940s
built tankers typical to this model
Sun Shipbuilding and Dry Dock Company
purchased tankers typical to this model
Standard Oil
ID Number
TR.313036
catalog number
313036
accession number
173712
This model represents the first major controlled circulation boiler in the United States. It was installed at the Somerset, Massachusetts Station of the Montaup Electric Company in 1942.
Description
This model represents the first major controlled circulation boiler in the United States. It was installed at the Somerset, Massachusetts Station of the Montaup Electric Company in 1942. Shortly thereafter the controlled circulation concept reached full commercial development and was widely used in public utility central stations throughout the world.
The history of steam power is one of increasing steam pressures in search of increased efficiency. However, with higher pressures the natural circulation of water of varying densities within the boiler's many circuits becomes less effective.
In controlled circulation boilers, water is continuously and rapidly circulated by pumps which are completely independent of the feed water pumps and thus operate with a relatively small pressure differential. By forcing the water's circulation, the elements of the boiler can be located without regard to hydraulic head, and because frictional loss is not a consideration, smaller tubes can be used. Further, heat is transferred from the fire to the water more efficiently.
The actual boiler this model represents could produce 650,000 pounds of steam per hour at 2,000 pounds per square inch pressure. It contained a volume of 7,800 gallons of water which the pumps could recirculate in just one minute.
date made
1941-1942
ID Number
MC.326787
catalog number
326787
accession number
263167
copyright date
1949
patent date
1933-01-17
ID Number
1989.0493.01
catalog number
1989.0493.01
accession number
1989.0493
This model represents one of the 2,710 Liberty ships built during World War II. The designation EC2-S-C1 was the standard designation of the dry cargo Liberty ships that were used by the United States Merchant Marine to transport nearly anything needed by the Allies.
Description
This model represents one of the 2,710 Liberty ships built during World War II. The designation EC2-S-C1 was the standard designation of the dry cargo Liberty ships that were used by the United States Merchant Marine to transport nearly anything needed by the Allies. Whether in Europe, Africa, or the Pacific, most of the essential supplies arrived on ships, including tanks, ammunition, fuel, food, toilet paper, cigarettes, and even the troops themselves. Manning these vessels was a dangerous task, as the merchant vessels faced tremendous losses from submarines, mines, destroyers, aircraft, kamikaze fighters, and the unpredictable elements of the various destinations. One in 26 merchant mariners died during the war, a higher fatality rate than that of any branch of the armed forces.
Even before the United States was officially involved in World War II, shipyards on the Atlantic, Pacific, and Gulf coasts were building Liberty ships. Drawing from lessons learned at Hog Island in the First World War, Liberty ships were standardized and designed to be built quickly and efficiently. Using new welding technology, workers pieced together prefabricated sections in assembly-line fashion. This largely replaced the labor-intensive method of riveting, while lowering the cost and speeding up production. While it took about 230 days to build one Liberty ship in the first year, the average construction time eventually dropped to 42 days, with three new ships being launched each day in 1943.
President Franklin Delano Roosevelt attended the launching of the first Liberty ship on September 27, 1941, at the Bethlehem-Fairfield Shipyard in Baltimore, Maryland. The ship was the SS Patrick Henry, named after the Revolutionary War hero whose famous “Give me Liberty or give me Death!” speech inspired the ships’ nickname. At the launching of the first “ugly duckling,” the President’s name for the stout and functional Liberty ships, he praised the shipyard workers: “With every new ship, they are striking a telling blow at the menace to our nation and the liberty of the free peoples of the world.” President Roosevelt proclaimed that these ships would help to bring a new kind of liberty to people around the world.
date made
early 1940s
launching of first Liberty Ship, SS Patrick Henry
1941-09-27
attended first launching
Roosevelt, Franklin Delano
ID Number
TR.313022
accession number
170015
catalog number
313022
Unlike car drivers on land, navigators at sea have no road signs to indicate speed limits, dangers, or routes. Navigational buoys are floating objects anchored to the bottom that serve as aids to navigation.
Description
Unlike car drivers on land, navigators at sea have no road signs to indicate speed limits, dangers, or routes. Navigational buoys are floating objects anchored to the bottom that serve as aids to navigation. Their distinctive shapes, colors, and other markings provide information indicating their purpose and how to navigate around them.
The placement and maintenance of navigational buoys are essential to shipping, since they often provide the only guidance for channel locations, shoals, reefs, and other hazards. If damaged by collisions, extinguished, or broken loose from their moorings, the Coast Guard will repair, replace, refuel, or relocate the failed buoy.
Designated an 8X20 LBR, this particular type of buoy was used by the U.S. Coast Guard Lighthouse Service on the East Coast from around 1930 until the early 1950s. It measures 8 feet in width and 20 feet high, and the letters mean Lighted, Bell, and Radar Reflector. It originally weighed ca. 15,600 pounds, including the 225-lb bell. The bottom of this example was removed to fit into the gallery.
It was designed to be deployed in shallow, protected coastal waters and could be seen about two miles away in daylight. The light on the top was powered by batteries stored under the round hatches in the large bottom compartment. The bell was rung by the rocking of the buoy in the waves.
ID Number
TR.336771
accession number
1978.2285
catalog number
336771
Hopper dredges are used to clear channels and offshore sandbars as well as sediment deposits that restrict navigation into rivers and harbors.
Description
Hopper dredges are used to clear channels and offshore sandbars as well as sediment deposits that restrict navigation into rivers and harbors. They work like underwater vacuum cleaners: each dredge is equipped with a suction pipe, or drag arm, that gathers up sediment from the bottom. The dredged sediment is then stored in the ship’s interior containers, or hoppers. When the hoppers are full, the dredge uses a series of pumps and pipelines to transport the sediment to a secondary location for disposal.
Built in 1926 by the Federal Shipping Company, a subsidiary of U.S. Steel, in Kearny, New Jersey, the hopper dredge Willets Point could raise sediment from depths of 12 to 35 feet. This 200-foot vessel was designed for the U.S. Army Corps of Engineers and represents the type of equipment used in early 20th-century harbor improvement work. In 1927 the Willets Point was commissioned to dredge sections of the Potomac River. At the time, large vessels could not reach Alexandria, Virginia, and Washington, D. C., because of sedimentation in the channels and harbors. Between January and April 1927, the Willets Point moved 581,507 cubic yards of sediment from the bottom of the Potomac.
Hopper dredges cannot move quickly while working. As a result, dredges use a series of signal patterns to let nearby ships know when they are actively working. During the day an arrangement of black circles and diamonds is raised up on the mast, while at night the dredges use an alternating pattern of red and white lights.
This cutaway model was built by Severn-Lamb Ltd., in Stratford-on-Avon, England.
date made
1970
1926
ID Number
TR.330083
catalog number
330083
accession number
288668

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