Two pocket-books of watch bills: one is marked Lieutenant Walker, HMS HERCULES, the other is unmarked. Neither contain any dates or locations. Both use the two watch system and contain clear names and rankings of entire large crews.

Administrative / biographical background
In the traditional Royal Navy watch system (a system used by most other Commonwealth navies), 'watch' refers to a period of time and to a grouping of personnel. Those members of the crew whose work must be done at all times of the day - known as 'watch-keepers' - are assigned to one of two watches: the Starboard or the Port watch. These can be further divided into two parts, e.g. First Port, Second Starboard. This is the case in both of these volumes.