26 



John Eliot — On the occasional Inversion of the Temperature [No. 1, 



Rawalpindi and Simla and Ludhiana. The first table gives the daily 

 range of temperature at three pairs of stations on six days of Januaiy 

 1889, when anticyclonic conditions accompanying inversion of vertical 

 temperature relations obtained in Upper India. 



Day 

 of month. 



Mnrree. 



Rawal- 

 pindi. 



Simla. 



Ludhiana. 



Ranikhet. 



Bareilly. 



3rd 



4th 

 8th 

 9th 

 21st 

 22nd 



9 8° 

 13-8° 

 135° 

 14-9° 

 18-8 

 ? 



33-6° 

 29-2° 

 357° 

 371° 

 332° 

 ? 



133° 



20-8° 

 17-6° 

 169° 

 130° 

 15-8° 



211-0 



36-2° 



28-6° 



328° 



34-8° 



29-6° 



16-1° 

 15-1° 

 14-2° 

 15-2° 

 201° 

 151° 



314° 

 30 4° 

 34-9° 

 31-9° 

 29-4° 

 30-4° 



Mean daily 

 range of select- 

 ed periods 



Normal daily 

 range of select- 

 ed periods 



14-2° 

 131° 



338° 

 27-0° 



161° 

 15-3° 



31-9° 



25-0° 



160° 

 14-9° 



314° 



24-9° 



Difference 



+ 1-1° 



+ 6-8° 



+ 08° 



+ 6-9° 



+ 1-1° 



+ 65° 



This table shews a considerable amount of irregularity at the hill 

 stations in the daily range of temperature during these periods of in- 

 version of night temperature. On the other hand the daily range of 

 temperatnre at the level of the plains is always excessive and approxi- 

 mately uniform as shewn by the Rawalpindi and Ludhiana data. 



The following table gives the variations of the maximum and mini- 

 mum tempei'ature on the same days at the hill stations from their normal 

 values at the same stations, a plus sign indicating that temperature was 

 in excess and a minus sign that it was below the normal. 





Murree. 



Simla. 



Ranikhet. 



Day of month. 



Maximum. 



Minimum. 



Maximum. 



Minimum. 



Maximum. | 



Minimum. 



3rd 



4th 



8th 



9th 



21st 



22nd 



+ 97° 

 + 96° 

 + 3-8° 

 + 7-8° 

 + 16'8° 

 ? 



+ 126° 

 + 8-4° 

 + 35° 

 + 5-9° 

 + 10-1° 

 ? 



+ 95° 

 + 14-4° 

 + 5-2° 

 + 4-5° 

 + 8-5° 

 + 11-6° 



+ 11-6° 

 + 9-0° 



+ 2-8° 

 + 2-5° 

 + 10-9° 

 + 10-8° 



+ 10-7° 

 + 15-7° 

 + 7-2° 

 + 6'1° 

 + 11.2° 

 + 13'7° 



+ 10-5° 

 + 16-6° 

 + 8-0° 

 + 58° 



+ 4-9° 

 + 12-2° 



Mean variation 

 from nor- 

 mal during 

 periods 



+ 9-5 



+ 8-1° 



+ 9-0° 



+ 79° 



+ 10-8° 



+ 9-7° 



This table shews conclusively that during these periods of inverted 

 temperature relations temperature was excessive at the hill stations and 

 the excess was nearly as marked in the night as in the day temperature. 



