Meteorological Records. 



77 



Another set of records, illustrated by diagrams V. and V.a, 

 show the average temperature in the shade, and it will be observed 

 that the readings have been taken at 6 a.m. and 12 noon. 



The next set of records are those which give the absolute 

 amount of moisture present in the atmosphere, given on the basis 

 of grammes per cubic metre. The records were also taken twice a 

 day, i.e.. 6 a.m. and 12 noon. It is difficult to say more than that 

 during the dry season the amount in grammes is only about one-half 

 of what it is in the wet season. The readings, as recorded by the 

 instruments, give the moisture existing in the atmosphere at the time 

 in percentage of possible moisture, i.e.. for each temperature and 

 pressure there is a possible maximum vapour tension. During the 

 earl\- morning the figures are generally higher than later on in the 

 day, and at 12 o'clock the possible is never reached except during 

 rain. 



AVERAGE MOISTURE IN THE AIR IX GRAMMES PER 

 CUBIC METRE. 



These records are merely the average of the weeklv averages, 

 which are obtained in the same manner as already described. 



It is most interesting to compare these records with the rainfall, 

 and. going still further, to observe the effect of rainfall on the 

 temperature, for there is always a sudden drop in temperature after 

 a rainfall, and these drops are brought out very graphically by the 

 thermograph diagram. Naturally, it is impossible to have all these 

 records mentally before one, therefore a few diagrams are attached 

 illustrating the point. Generally speaking, the amount stated in 

 grammes per cubic metre is about 4'6 grammes in the dry season 

 and double this amount in the wet .season, and a glance through 

 the average figures month by month and year bv \ear gives a fair 

 indication of the season with regard to the rainfall. 



