Screw Propellor, Patent Model

Description
This is the patent model of John MacHaffie's screw propeller, which he called "the citropeller adopted to aquatic propulsion."
John MacHaffie, a British citizen living in Schenectady, New York, received a patent in 1892 for a new propeller shaft arrangement, wherein the speed and direction of a propeller could be adjusted by moving the drive shaft in and out. The adjustable shaft would engage a clutch in the propeller bearing, causing the propeller to spin forward, stop, or reverse without changing the speed or direction of the shaft or the vessel's engine. MacHaffie's specification also outlined a way to use his invention for steering as well, but that possibility is not reflected in the patent model. MacHaffie called his device a "citropeller," perhaps intending to mean a propeller tilted sideways.
MacHaffie's citropeller was also covered by British patent 12,361, August 7, 1890.
Location
Currently not on view
Date made
1892
patent date
1892-09-27
patentee
MacHaffie, John
inventor
MacHaffie, John
associated place
United States: New York, Schenectady
Physical Description
wood (base material)
brass (overall material)
ID Number
TR.308548
catalog number
308548
accession number
89797
patent number
483,158
subject
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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