The longitude (abbreviation: Long., Î», or lambda) of a point on the Earth's surface is the angle east or west from a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses (often improperly called great circles), which converge at the north and south poles.
Use the dual thermometers to calculate relative humidity. Fisher Scientific Mason's Hygrometer has one dry thermometer and one wet thermometer which provide temperature readings for determining the relative humidity.
Switch to new thesaurus. hygrodeik - a wet and dry bulb hygrometer. hygroscope - hygrometer that shows variations in the relative humidity of the atmosphere. measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something. psychrometer - a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air.