580 SEC. 14. METEOROLOGY. 



It consists of four small hollow hemispherical cups (Dr. Robinson's form) 

 fixed to a vertical axis ; the lower end has an endless screw. This works a 

 wheel, the complete revolution of which is equal to ^ of a mile. Its action is 

 conveyed to others that carry indexes over divided circles on the face of the 

 dial, which is mounted on a circular box fixed on a metal base ; readings can 

 be taken from -j-i^ up to 1,000 miles. Its weight, 1^ Ibs., and it packs in a 

 mahogany case about 4 inches square. 



This is a most sensitive instrument ; its indications are as accurate as those 

 of the large kind. 



V. RAIN GAUGES. 



2847. Rain Gauge. In use at meteorological stations belong- 

 ing to the Norway Meteorological Institute. 



Professor H. Moh?i, Christiania. 



Square surface, 15x15 centimetres, height 50 centimetres, for catching 

 snow ; the lower part protected against evaporation. The rain (or melted 

 snow) water is to be poured out of the gauge through one of its upper 

 corners, into a measuring cylindrical glass, divided to show the height of fallen 

 rain in millimetres. The gauge is made of plate iron, after design made by 

 Professor H. Mohn. The measuring glass was calibrated at the Meteorological 

 Institute, in Christiania. 



2848. Rain Gauge, No. I. Scottish Meteorological Society. 



Designed to obviate errors due to out-splashing and in-splashing of rain 

 drops. Designed by Thomas Stevenson, C.E., F.H.S.E., Honorary Secretary, 

 and described in the Edinburgh Philosophical Journal, 1842. 



2849. Jagga's Rain Gauge, No. II. 



Scottish Meteorological Society. 



The principle of this gauge consists in making the diameter of the funnel 

 equal to 4 '697 inches, so that a fluid ounce of the rain-water collected equals 

 one-tenth of an inch of rain. Designed by G. V. Jagga, Eao of Vizagapatam, 

 and introduced to the Society by Sir Walter Elliot, Member of Council, and 

 Described in the Society's Report, quarter ending June 1861, p. 9. 



2850. Ship Rain Gauge, No. III. 



Scottish Meteorological Society. 



This gauge is swung upon a horizontal swinging ring like a compass, which 

 may be either fitted to a frame or suspended by a bracket. It is divided into 

 two equal parts, fitting into each other about the middle of the instrument, 

 which will always be maintained in the perpendicular position like a sea 

 barometer. The advantages of this gauge are horizontally and saving of 

 trouble in reading, and its principle consists in the use of cones to collect the 

 rain. Designed by W. T. Black, Esq., Surgeon-Major, and described in 

 the Society's Journal, vol. iii., p. 17. 



2851. Ronalds 9 Rain and Vapour Gauge, erected at the 



Kew Observatory in 1843. 



Kew Committee of the Royal Society, Kew Observatory. 



