29 
METEOROLOGY AND CLIMATOLOGY. 
6 r a quarter of an hour before using, it will be sufficient to note the 
temperature of the air in the usual way. 
Fig. 6. The Collie Barometer, with the Deasy Mounting, in 
its Normal Working Position. 
Fig. 7. The Upper Carriage and Vernier on a larger scale, 
with Barometer attached. 
Fig. 8. The Lower Carriage and Vernier, with Keservoir End 
op Barometer attached. (Same scale as Fig. 7.) 
The upper end (Fig. 7) is about 2*5 inches long, and contains an 
air-trap, into which all the air that may accidentally enter the baro¬ 
meter, either by the tap leaking, through the rubber tubing, or through 
