ON ELECTRICAL OBSERVATIONS AT KEW. 185 
Taste XCIII.—Instances of negative electricity without rain. 










Date. Observed limits of time. {Observed extremes of charge. ee. off 
1843 and 1844.) h m h m in. 
Sept. 10. | 2 10p.m.| 2 47 pm.|  40"P. 45"N. | 0-400 
Oct. 12. | 1 15 pm.| 2 45 pom. |... e000 N. 
Nov. 24. | 0 30 pm.| 1 30pm. | ......... 6™N. 
OS SES TS lle Ae eee 15*N. 
» 6. | 4 Opm.| 5 Opm. 3YN. 10°N. 
a he be TNE LON a 8 CNS a pt N*. 
» 18. |: 6.20 p.m.| 6 30 p.m..| . ........ 50"N. 
Aug. 8 | 1 26 pm.| neces | veseeee | 5SOZN. | 0°500 
ee LOL OAM st ocnnn son) |” 45> canoes 5" N. 
” 17. 3 0 p-m. 4 O PMs | seeeeeeee | 5=N. 

* Charge high. 
Notes on Taste XCII. 
(*) August 4, 1843.—This thunder-storm was observed at Greenwich : 
cumulo-stratus and scud were registered there at 38 20™ p.m. with occasional 
showers, soon after which the sky assumed a very stormy appearance, more 
particularly in the N. and N.W.; at 32 45™ p.m. a low muttering of distant 
thunder was heard from dark clouds in the N.W., and thunder has been 
heard’at intervals to the present time, 5°20™ p.m.: at 42 40™ p.m. rain began 
to fall, and it has continued: at 4° O™ p.m. a fine double rainbow was visible 
in the E.N.E., and at 55 20™ p.m. another very perfect one, also double in 
the E.: at present, 5" 20™ p.m., a large clear break is near the horizon in 
the W., and it is the only part of the sky which is not covered with a dense 
-cirro-stratus. At 75° 20™ large loose fragments of scud were passing from 
_ the §.W., the portions of the sky without cloud being remarkably clear; the 
- rain which commenced at 4" 40™ p.m. ceased at 5° 30™ p.m.; the last clap 
__ of thunder was heard at 5" 35™; it proceeded from dark clouds in the E.: 
_ no lightning was seen during the whole time. The galvanometer was affected, 
the needle moving towards A. 
(°) August 15, 1843.—The thunder-storm was observed at Greenwich. 
At 32920" p.m. cumuli and cumulo-strati were seen; weather hazy. At 
_ 55 20™ p.m. the same clouds were registered, and the observer thus writes: 
~ “Deep mutterings of thunder are heard, proceeding from dark eumulo-strati 
towards the N.E.: the weather is unusually sultry for this time of the day ; 
temperature now at its maximum.” At 72 20™ “massive cumulo-strati and 
nimbi in all directions: at 5" 40™ p.m. aloud clap of thunder was heard from 
the S.E., and from that time to 6" 10™ p.m. a constant succession of claps 
_ took place; no lightning was seen: between 55 50™ p.m. and 6? 5™ p.m. the 
rain fell very heavily : distant thunder has been heard to the present time.” 
~ © At 9» 20™ overcast: at 75 40™ a vivid flash of lightning was seen in the 
__N.E. which was followed by many others, chiefly forked, and accompanied 
_ by a heavy rolling of thunder, all from the N.E.: at present distant thunder 
~ is heard, and occasionally faint flashes of lightning from the N.W.: during 
5 the time the storm was in the N.E. the zenith was clear.” Between 
_ 5° 49™ p.m. and 65 12™ p.m., the galvanometer was affected; maximum de- 
 viation towards A 50° at 55 49™ 3s, and towards B 65° at the same time. 
This, the greatest oscillation, occurred on the occasion of a loud clap of 
a 
7 
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