Page:Madras Journal of Literature and Science, series 1, volume 6 (1837).djvu/318

296 covered with muslin and wetted with common water, as it was found to give the same indications as when wetted with distilled water.

To test the indications of the wet bulb thermometer the black ball of the hygrometer was covered with muslin, and both balls being wetted the enclosed thermometer gave the same indications as the small wet bulb thermometer, and therefore there appeared no reason to doubt its accuracy on account of its being small.

The barometer was a very rough instrument on the wet tube plan, and the scale very imperfectly divided. The observations have therefore been given reduced to the temperature of 32° Fahrenheit. The mean pressure at Chicacole at 10 was found to be 29.71; at Berhampore 29.75, and at Aska 29.68, which are sufficiently accurate to give confidence in the indications of the last instrument.

The hygrometer was one on Daniel's construction made by Newman, and the observations were generally repeated on any change of the dew point to ensure accuracy.

1836

Monecheeserroo 22d November 8 27.19

9 27.27

Buchingiah 27th 6  27.46

9 27.60

28th 1  27.40

29th 7  27.37

10 a. m 27.42

30th 9  27.60

1st December Noon 27.61

2 27.49

2d 8  27.58

5th 10  27.66

Woodigherry 1st January 11 27.86

3 p. m 27.66

2d Noon 27.74

Sarrungurrah 15th 3  27.39

16th 7  27.53

Sonepore on the Mahamuddy 11th February 3 29.24