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.
Some are known to you , such as the thermometer , which gives the internal temperature of the Nautilus ; the barometer , which indicates the weight of the air and foretells the changes of the weather ; the hygrometer , which marks the dryness of the atmosphere ; the storm-glass , the contents of which , by decomposing , announce the approach of ...