maximum and minimum values. Maintenance consisted of periodically removing 

 and cleaning the thermometers with soap and clean water and lubricating the 

 Townsend support used to hold and reset the instruments. 

 Rain Gage 



33. 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 (Figure 2). The 

 manufacturer's specifications indicated that the instrument accuracy was 

 +0.5 percent for precipitation amounts less than 15 cm and +1.0 percent for 

 amounts above 15 cm. 



34. 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, was checked daily, and very 

 few discrepancies were identified throughout the year. The weighing rain gage 

 required little maintenance except to wind the clock and ink the pen. 



Sling psychrometer 



35. A sling psychrometer was used to measure wet and dry bulb tempera- 

 tures for determining relative hmnidity and dew point. The psychrometer con- 

 sisted of two thermometers mounted in a frame; a moistened muslin wick was 

 attached to the bulb (i.e. wet bulb) of one of the thermometers, and the 

 device was whirled to ventilate both thermometers. After the wet and dry bulb 

 temperatures were read, a set of NWS tables was used to determine the dew 

 point. 



36. These thermometers required little maintenance except that required 

 to change the muslin wick every month or two and to clean the sling and ther- 

 mometers with soap and water. The instruments were not calibrated, but the 

 thermometers were compared daily to detect any bias or malfunction. 

 Pyranograph 



37. A mechanical pyranograph, manufactured by the Weather Measure 

 Corporation, Sacramento, Calif., was located on top of the weather instrument 

 shelter and provided a record of the duration and intensity of solar radia- 

 tion. The pyranograph was not calibrated but was observed to operate in a 

 reasonable manner. This equipment required that the glass cover be cleaned, 

 the chart paper changed every week, the timer wound, and the pen inked. 



15 



