VIRTUAL TOUR OF THE WEATHER STATION
TILTING SYPHON RAINFALL
The station has two tilting syphon rainfall recorders. The instrument makes a continuous measurement of rainfall duration and intensity. Rainwater is channelled into a float chamber where the changing level of water is recorded graphically via a pen to a rotating drum. The instrument pictured here uses a 24 hour clock - the chart is changed everyday at 0900 GMT and the rainfall duration calculated over the previous 24 hours. A second instrument operates on a 7 day clock providing a back-up to the first recorder. A light bulb, connected to an outdoor thermostat, is used to prevent the water in the float chamber from freezing thus preventing damage.