A Barometer Manual for the Use of Seamen; with an Appendix on the Thermometer, Hygrometer, and Hydrometer. Issued by the authority of the Meteorological Committee. Sixth edition, extensively revised.

What you need to know: Composed of a barometer, hygrometer and thermometer, this affordably priced option provides a good indication of how comfortable the day’s weather will be. What you’ll ...

is blue when dry, and red when moist; and I have found it very sensitive to slight changes in the quantity of moisture in the atmosphere, being more delicate than the thermometers I used.

A thermometer and hygrometer mounted in a screen A good ... Finally, if you haven't already got a barometer in the hallway, a simple one with a clear scale in millibars (now renamed hectopascals ...