240 Mr. Howard's Meteorological Journal . [Sept. 1820. 



REMARKS. 



Seventh Month. — 1. Fine. 2, 3. Showery. 4 — 6. Overcast. 7 — 9. Cloudy. 

 10 — 13. Fine. 14. Cloudy. 15. Fine. 16. A heavy ihunder shower about 

 eleven, a.m.: an unusually heavy shower of rain about half-past one, p.m. 

 17, 18. Rainy. 19. Cloudy and fine. 20. Cirrus: Cirrocumulus : cloudy: 

 showers, with some thunder. 22. Cloudy and fine. 23. Overcast. 24 — 26. Cir- 

 rocumulus: cloudy. 27. Cirrocumulus: Cirrostratus : Cirrus. 28. Cirrus: Cirro- 

 cumulus. 29. Cirrus: clear. 30. Fine day: a thunder storm commenced about 

 ten, p.m. and continued about three and a half hours: the lightning extremely 

 vivid and frequent: the Ihunder mostly distant and nearly continuous: at half-past 

 eleven, after a very loud clap of thunder, heavy rain began with us. 



RESULTS. 



Winds: N,4; NE,5; E, 1 ; SE, 3 ; S, 1 ; SW,3; W, 1 ; NW,9; Var. 4. 

 Barometer : Mean height 



For the month 29-973 inches. 



For the lunar period, ending the Ist 1 30-035 



For 13 days, ending the 1st (moon south) 30-160 



For 14 days, ending the I5th (moon norih) 30-084 



For the lunar period, ending the 31st 29-966 



For 13 days, ending the 28th (moon south) 29-838 



Thermometer : Mean height 



For the month 61-129° 



For the lunar period, ending the 1st 53-034 



For the lunar period, ending the 31st 64-916 



For 31 days, the sun in Cancer. ., 61887 



Evaporation 3- 17 jncli. 



Rai n a-SS 



The meau of the hygrometer is for the latter 17 days of the month 79-35», but 

 the mean deduced for the like space from a new one now substituted for it is 

 64-88°: it appears, therefore, that the old one, the inaccuracy of which has been 

 heretofore stated, will require a deduction of 14 degrees from its later results. It 

 appears to have been emplojed from about Midsummer, 1819; ^A the error, 

 which has apparently arisen from the stretching of a too slender piece of whale- 

 bone, has probably increased from that time to the present. 



Laboratory, Stratford, Eighth Month, 21, 1820. R. HOWARD. 



