instrument shelter located 43 m behind the dune (Figure 2). The shelter was 
designed with louvered sides, a double roof, and a slatted bottom for housing 
instruments requiring protection from direct sunlight (Figure 3). 
Figure 3. Louvered instrument shelter (background) 
and rain gages (foreground) 
31. The actual temperature readings at the time the thermometers were 
read (i.e. the present temperature) were compared to ensure accuracy of the 
maximum and minimum values. Maintenance consisted of periodic removal and 
cleaning with soap and water and lubricating the Townsend support used to hold 
and reset the instruments. 
Rain gage 
32. A 30-cm weighing rain gage manufactured by the Belfort Instrument 
Company, Baltimore, Md., used to measure the daily amount of precipitation, 
was located near the instrument shelter 46 m behind the dune (Figures 2 and 
3). The manufacturer's specifications indicated that the instrument accuracy 
was +0.5 percent for precipitation amounts less than 15 em and +1.0 percent 
for amounts above 15 cm. 
33. A 15-cm-capacity "true check" clear plastic rain gage with a 
0.025-cm resolution, manufactured by the Edwards Manufacturing Company, 
Alberta Lea, Minn., was used to monitor the performance of the weighing rain 
gage. This gage, located near the weighing gage (Figure 3), was checked 
19 
