45, COENHILL, B.C., AND 122, REGENT STREET, W., LONDON. 



FIG. 100. 



121. Symons' Storm Rain Gauge, (fig. 101). This 

 instrument the inventor states he constructed, not as a 

 standard or thoroughly accurate instrument, but as very 

 convenient for observing the rate of rainfall minute by 

 minute without either measuring or going out of doors. 

 The area of the funnel as compared with that of the 

 glass tube is so large that an inch of rain is about 2 feet 

 long on the tube, therefore, as each tenth of an inch is 

 about 3 inches long, the water can be seen gradually 

 rising in the tube as the rain continues, and the quantity 

 FIG. 101. in any interval, however short, may be easily noted. 



In order to facilitate reading at a distance floats are placed in each tube, and 

 these being white while the board is black are clearly visible at a great distance. 

 Each division on the scale is a tenth of an inch, and it will be seen that the 

 first being filled up to the top line (i.e., ten tenths, or one inch) the rain flows 

 into the second and that float begins to rise until two inches of rain have fallen. 

 The Gauge is emptied by turning the button (A) and then inverting the 

 Gauge, the floats cannot fall out. In frosty weather it is advisable to empty 

 out all water from the Gauge and place a cover over the collecting funnel. 



Price for Symons' Storm Kain Gauge 220 



A larger form of Registering Rain Gauge (Pluviograph) will be described 

 in connection with Osier's Anemometer. 



122. The measurement of Snow or Hail is a to be effected by thawing the 

 quantity collected in the funnel of the rain gauge, and measuring the water 

 resulting therefrom. The rain gauge recommended by the Meteorological Office 

 (No. 99), is specially contrived and adapted for this purpose, the snow or hail 

 collected being thawed by a known quantity of hot water. This quantity 



