Captain William L. Hudson was commander of the US ship Peacock, one of the vessels of the United States Exploring Expedition to the Pacific, 1838-42, commanded by Commodore Charles Wilkes. He later transferred his flag to the Porpoise.

The journal begins when the expedition was en route from Fiji to Honolulu, and gives an account of the PEACOCK's visits to the Hawaiian Islands, Oregon, Southern California, the Line, Phoenix and Tokelau Islands, Samoa, the Ellice and Gilbert Islands (Tuvalu and Kiribati), and the wreck of the PEACOCK at the mouth of the Columbia River on the west coast of North America. After Hudson had transferred his flag to the USS PORPOISE, he crossed the Pacific to the Philippines, Sooloo Islands and Singapore. (The journal is a continuation of that filmed as PMB 146, which covers the Expedition's activities from 20 August 1838 to 8 August 1840)