ship's journals (weather books), which were laid out according to a common international scheme, to the ship's captains who wanted to contact the naval observatory, gave instructions on the correct keeping of these weather books and collected and discussed them for the purpose of drawing up general and special sailing instructions as well as the travel routes to be taken.

Instrument procurement and testing

The second department was responsible for procuring and testing nautical, meteorological, and magnetic instruments and apparatus.

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