102 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. /Q 



correction applied to the pressure values for a 

 height of 72 ft. is +.102 in. This is too high by 

 .027 in., and a correction of —.027 in. has been 

 applied from 1900 July to 1920. 

 All values have been corrected to normal gravity (Lat. 45°) 

 by applying a correction of — .072 in. 

 Temperature. 



Authorities: As for Pressure. 



Site: As for Pressure. No correction has been applied for the 

 change of site. Inspection of the daily observations 

 covering the change indicates that the correction 

 required would be small. 

 Observations: All values have been corrected to the mean of 

 24 hours, by corrections (Table B) based on 

 3^ years observations at Trinidad.* The corrections 

 were applied to the readings at the following hours : 

 1862 February to 1884. ^(9^+15^)''. 

 1887 January to March. ^(9+15)''. 

 1887 April to 1920. 1(7+15)''. 

 Precipitation. 



Authorities: As for Pressure, with the addition of 1885 and 



1886 from the Trinidad Blue Book, 1919. 

 Site: As for Pressure. No correction has been applied for the 

 change of site. 



Table A. — 'Corrections /Ippticd to the Pressure J'alucs to Reduce to 

 the Mean of _'-/ Hours. 



Jan. Feb. Mar. Vpr. May .Iiine .July Aiip. Sept. Oct. Nov. Dec. 

 Inches. 



iOi*" + 1.54'')— 003 —.003 — .001 +.001 +.003 1-.003 H .002 —.002 —.005 .000 —.002 —.004 



4(9'' + l.")" )— .007 — .004 — .003 



iO^ + 15*^ ) .000 +.004 +.004 +.00G +.00fi +.007 +.010 +.011 +.007 +.004 +.004 +.003 



Table B. — Corrections Appfied to the Temperature I'alues to Reduce to 

 the Mean of 34 Hours 



Jan. ViA>. Mar. .\pr. May Jinie Jnly Aug. Sept. Oct. NdV. Oec. 



"F. 



H9i*^ + IS^h) —4.2 —4.4 —i.5 —4.6 —4.3 —3.6 —3.4 —3.6 —3.9 —4.0 —3 9 —3.9 



4(9'» + IS"* ) — 3.8 —4.0 —4.1 



i(7'' + 15" ) —0.7 —0.8 —0.7 —0.9 —0.8 —0.5 —0.3 —0.3 —0.4 —0.5 —0.5 —0.6 



* Hann, J. von. Der Tiigliche Gang der Temperatur in der Ausseren Tropen- 

 zone. A. Das Amcrikanisclie und Afrikanischc Tropengebiet. Wien, 1907. 



