has a known elevation relative to tidal bench marks and the National Geodetic 

 Vertical Control Network. The electric tape gage readings are compared with the 

 automatically recorded tide record. Additional details on each gage may be ob- 

 tained from the respective manufacturer. 



2. Meteorological Instrumentation . 



To monitor the meteorological conditions at the FRF, various equipment has 

 been installed by the NWS and CERC. Figure 2 shows the location of the mete- 

 orological instruments. Although CERC is responsible for collecting the data, 

 NWS provides guidance on installations and maintains the anemometer. In ad- 

 dition to any permanent records obtained from the devices with recording 

 capabilities, each instrument is read daily (at approximately 0700 hours) . Ad- 

 ditional details on the instruments described below may be obtained from the 

 respective manufacturer or from NWS. 



a. Anemometer . A model F420C anemometer is used to measure wind speed and 

 direction (Fig. 19). A cup rotor and a spread-tail wind vane were installed on 

 a 21-foot-high tower about 65 feet from a temporary office trailer. The ane- 

 mometer is coupled to wind speed and direction gages inside the trailer to moni- 

 tor the onshore wind conditions (Fig. 20), The gages are manufactured by the 

 Electric Speed Indicator Company, Cleveland, Ohio. 



Figure 19. A model F420C anemometer used to measure wind speed 

 and direction. 



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