Sherman's team did not attempt to distinguish logbooks from journals.
A logbook or formal record, maintained with several daily entries, usually by the master or mate, is likely to have been kept on every whaling voyage.
Lesser journals, often by mates or surgeons, give interesting insights into life on board that are not included in the logbooks.
In view of the important distinctions, notably in precision, between the contents of a formal logbook and a less formal journal, we have here attempted to indicate which is which.
Johannesen noted in the ship's logbook mostly about weather, currents, ice, and temperature.
In the evenings, subjects recorded several behavioural characteristics in daily logbooks.
Of particular value among whaling records are the logbooks that were kept on board the ships, recording day-to-day events of each voyage.
The number of fetal echocardiograms performed and interpreted should be kept in a logbook.