Patent Model, Endless Chain Propeller

Description
This model accompanied Luther Alvord’s patent application for an “endless chain propeller” that received patent number 174,178 on February 29, 1876. He also claimed it would work as a dredge for removing sand and mud from shipping channels.
"This invention consists, generally," Alvord wrote, "of a series of blades connected to form an endless apron or railway, which, moving over rollers at both of its ends [and] attached to the bottom of the boat, acts directly upon the water to produce the desired propulsion." Although he did not claim to have invented "the principle of an endless chain of buckets or floats," he asserted that his V-shaped interlocking blades were an original design that would be strong and resistant to strain as well as suitable for canal-boat propulsion, as "the water escaping behind a boat employing this device...will not make a wash" that could damage a canal's banks.
Location
Currently not on view
Date made
1876
patent date
1876-02-29
patentee
Alvord, Luther
inventor
Alvord, Luther
associated place
United States: Massachusetts, South Hadley Falls
Physical Description
metal (blades and rollers material)
wood (frame material)
Measurements
overall: 12 in x 3 1/2 in x 5 1/4 in; 30.48 cm x 8.89 cm x 13.335 cm
ID Number
TR.325943
catalog number
325943
accession number
249602
patent number
174,178
subject
Maritime
Patent Models
See more items in
Work and Industry: Maritime
America on the Move
Transportation
Data Source
National Museum of American History, Kenneth E. Behring Center

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