Describe in brief working of Symons rain gauge with neat labelled sketch.

Describe in brief working of Symons rain gauge with neat labelled sketch.
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Answer :

The most common type of non- recording rain gauges used in our country is the ‘Symon’s raingauge’. 


Working: A Symons Rain gauge consists of a cylindrical vessel of 127 mm internal diameter with an enlarged base of 210 mm diameter. Inside the cylinder, a rain collecting bottle, made up of glass is placed. Over the top of this bottle, a glass funnel is inserted. The top section of the funnel is provided with a circular brass ring of exactly 127 mm diameter. With each raingauge, a cylindrical graduated measuring glass is also provided. Each graduation of this glass reads 0.2 mm. The reading should be read correctly upto 0.1 mm. The raingauge is set upon a concrete block. The rim of the funnel should remain at least 305 mm above the ground. The bottle collects the rain falling over the rim which is then measured by the measuring glass in ‘mm’ and ‘tenth of mm’


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