Meteorology · Instruments — Barograph
A barograph is valuable to the mariner because it:
- AIndicates the vessel's heading
- BMeasures only the present wind speed
- CShows sea-surface temperature
- DRecords a continuous trace of pressure over time, revealing the rate and pattern of change (tendency)✓ Correct
Explanation
The barograph draws a continuous record of barometric pressure, so the navigator sees not just the current value but the trend and rate of change. A sharply falling trace warns of an approaching or deepening low; the shape of the trace aids single-station forecasting.
Authority: Bowditch (Pub. No. 9), Instruments
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