8 smithsonian miscellaneous collections vol. 90 



Pressure. 



Site: The barometer was at a height of 224 ft. above Mean Sea 

 Level throughout the period. 



Instrument: Barometer No. M. O. 1233 Kew Pattern. Index 

 error correction —.003 or —.004 in. (according 

 to the reading) applied. 



Hours: The hours of observation were g h and iy h throughout. 

 All values have been reduced to the mean of 24 

 hours by the following corrections based on obser- 

 vations at Duala and Sansane Mangu : 



Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 



In. +.001 +.002 +.002 +.002 +.002 +.002 .000 .000 .000 +.001 +.002, +.001 



Notes: All values have been reduced to normal gravity (Lat. 

 45°) by applying a correction of —.073 in. or 

 — .074 in. according to the barometer reading. 

 The value for January 1929 was computed from the read- 

 ings at 9 11 by applying a correction of +.044 in. 

 Temperature. 



Site: As for Pressure. 



Exposure: 1921-1925 May. The thermometers were suspended 

 on a covered wooden frame under a thatched 

 shelter. 

 1925 June- 1 930. The thermometers were exposed in a 

 Stevenson screen. 

 Observations: The standard adopted is the mean between the 

 mean daily maximum and the mean daily minimum. 

 The mean for 1929 June was computed from |(Max. + 9 h ) 

 by applying a correction of — 4.25 ° F. 



GAMBAGA, GOLD COAST 



Authority. 



Director of the Meteorological Office, London. 

 Station closed in March 1921. 



HELWAN, EGYPT 

 Authority. 



Physical Department, Ministry of Public Works, Cairo, Egypt. 

 Pressure. 



Site: The height of the barometer above Mean Sea Level was 

 1 15.6 m throughout the period. 



