OMBROMETER. 23 



raost oblique angle during a strong wind. A considerable space 

 also around the mouth of the funnel should be kept free from 

 plants, as weeds or long grass, and the ground so level as to 

 prevent the formation of eddies or variations in the velocity of 

 the wind. 



To ascertain the amount of water produced from snow, a co- 

 lumn of the depth of the fall of snow, and of the same diameter 

 as the mouth of the funnel, should be melted and measured as so 

 much rain. 



The simplest method of obtaining a column of snow for this 

 purpose is to procure a tin tube, about two feet long, having 

 one end closed, and precisely of the diameter of the mouth of the 

 gage. 



With the open end downward, press this tube perpendicularly 

 into the snow until it reaches the ground or the top of the ice, 

 or last preceding snow; then take a plate of tin, sufficiently large 

 to cover it, pass it between the mouth of the tube and the ground, 

 and invert the tube. The snow contained in the tube, when 

 melted, may be measured as so much rain. When the snow is 

 adhesive, the use of the tin plate will not be necessary. 



From measurements of this kind, repeated in several places 

 when the depth of the snow is unequal, an average quantity may 

 be obtained. 



As a general average, it will be found that about ten inches 

 of snow will make one of water.] 



Mr. Guest, of Ogdensburgh, N. Y., recommends, from an 

 experience of six years, the following as the best plan for ascer- 

 taining the amount of melted snow. Procure a cylindrical tin 

 tube of the exact diameter of the mouth of the rain-gage and two 

 or three feet long, so that the snow cannot be blown out. Place 

 this vertically in a properly exposed position, and firmly secure 

 it against the action of the wind, which would otherwise blow it 

 over in a violent storm. After the snow has ceased to fall, bring 

 the vessel with its contents into the house, near a fire, which will 

 gradually melt the snow, and afterwards measure the water pro- 

 duced by means of the rain-gage. 



