Screw Propeller, Patent Model


This patent model represents Jackson Harrington's 1875 design for a "propeller-wheel," which improved upon a propeller he and a colleague invented in 1866.

The Patent Office issued over 800 patents for paddle wheels, propellers, and other propulsion apparatus between 1790 and 1873. About 250 of these were propellers.

Jackson Harrington and Francis Caffrey, then of New Haven, Connecticut, patented a six-bladed propeller design in 1866 that aimed to "enlarge the driving-surface" of the propeller "by means of parallel blades with an aperture between them." Nine years later, Harrington, now living in the town of Groton Bank outside New London, patented an improvement to his and Caffrey's earlier design. The new propeller still had six blades, but instead of grouping them in pairs around a single hub, he specified that three go on a forward hub and three on a rear hub. This arrangement aimed to make the propeller easier and cheaper to manufacture. Harrington further refined the shape of the blades and their positions relative to each other, toward the end of reducing friction between propeller and water.

Harrington, born in 1827, and Caffrey, born in 1828, were both machinists.

Date Made: 1875Patent Date: 1875-04-13

Patentee: Harrington, JacksonInventor: Harrington, Jackson

Location: Currently not on view

Associated Place: United States: Connecticut, New Haven

Subject: Patent Models


See more items in: Work and Industry: Maritime, America on the Move, Transportation


Exhibition Location:

Data Source: National Museum of American History

Id Number: TR.308561Catalog Number: 308561Accession Number: 89797Patent Number: 162,063

Object Name: screw propellor, patent modelpatent model, propeller, screwObject Type: Patent ModelOther Terms: patent model, propeller, screw; patent model, screw propeller; propeller; Maritime

Physical Description: brass (overall material)Measurements: overall: 1 1/2 in x 3 in; 3.81 cm x 7.62 cm


Record Id: nmah_843803

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