METEOROLOGICAL OBSERVATIONS. 



199 



(2). The correction for temperature is to be next applied to 

 reduce the readings to a fixed temperature, viz. 32°. Table I.* 

 gives these corrections for every half-inch, from 28'5 ins. to 

 30-5 ins., and for each degree of the attached thermometer from 

 30° to 79°. In using the table, first find the temperature in the 

 left-hand column corresponding to that of the attached thermo- 

 meter, then run the eye along the horizontal line to the column 

 corresponding to that of the reading of the barometer, and the 

 value there found is the correction required. Example: Barometer 

 reading 29-500 ins., attached thermometer 40°. On the line opposite 

 to 40^ and under 29-5 ins., is the correction — -030 in. If 

 the attached thermometer or barometer readings be interuiediate 

 between those given in the table, the corrections can easily be 

 found by interpolation. 



Table II. — Corrections for Reducing Observations of the 

 Barometer to Sea-level. 



* Tables I. and II. have been compiled from tables in ' Instructions in the 

 Use of Meteorological lustrumeuts.' By liobert H. Scott, M.A., F.K.S. London, 

 1875. 



