File:F._P._Smith's_original_1836_screw_propeller_patent.jpg Knowpia

File information

Description

Francis Pettit Smith's original 1836 patent for a single threaded marine propeller of two full turns. Later in the same year, Smith would file a revised patent for a propeller of one turn.

Source

Hebert, Luke (1849): The Engineer's And Mechanic's Encyclopaedia, Volume 2, Thomas Kelly publisher.

Date

1836

Author

F. P. Smith

Permission
(Reusing this file)

This image is in the public domain in the United States because it was first published outside the United States prior to January 1, 1929. Other jurisdictions have other rules. Also note that this image may not be in the public domain in the 9th Circuit if it was first published on or after July 1, 1909 in noncompliance with US formalities, unless the author is known to have died in 1953 or earlier (more than 70 years ago) or the work was created in 1903 or earlier (more than 120 years ago.)^[1]

Summary