A reader named Resi tipped me off to this wonderful website where you can see the pages of a journal kept by a young girl while she was at sea on a whaling ship in 1869 (her father was the captain):

Laura Jernegan: Girl on a Whaleship – Explore Laura’s Journal.

It’s pretty amazing to think of being a 6-year old along for the ride on a whaling ship! What a treasure to have her observations on the journey.