How do portable sundials and compasses work together?

Pocket-sized combinations used the magnetic compass to align the device with true north and the sundial to tell local apparent time. Travellers relied on this pairing to determine both direction and time without electricity. Folding gnomons and graduated brass scales allowed these instruments to be adjusted for different latitudes while on the move.

How were marine chronometers kept accurate?

A marine chronometer was housed in a gimbaled brass box inside a wooden case to isolate the clockwork from the roll and pitch of a ship. This constant motion-dampening setup ensured the escapement mechanism maintained a steady rate. Navigators wound these two-day clocks daily and checked them against port standards to calculate longitude.

What was the purpose of a station pointer?

Cartographers and surveyors used station pointers to map coastlines and plot precise positions from nautical angles. By sighting three fixed shore landmarks, an operator set the movable legs to match the measured angles. Placing the instrument on a chart instantly revealed the exact location of the vessel.