Mr. Bennet’s Defer iption of a Doubler of Ekftricity. 
Diary of atmofpherical Ele&ricity. 
Time of obfervation. 
\ 
Weather. 
Winds. 
Baro- 
meter. 
Thermo- 
meter. 
Hygro- 
meter. 
Electri- 
city. 
Inllruments to 
coiled:. 
Number of times doubled, and other obfervations. 
r 7 S 7 . 
Jan. 23. 11 o’clock morning 
Cloudy 
W. moderate 
in. 
29-3 
0 
44 
In. 
of M 
Pofttive 
Torth and bottle 
Plate once lifted up. 
Ditto. ^ _ 
Ditto. 
24. i paft 10 morning 
25. 1 1 morning 
Thin clouds 
Thin clouds 
N. moderate 
E. gentle 
29 44 
29 S' 
42 
37 
of M 
of D 
Pofitive 
Pofitive 
l D° 
D° 
25. 12 at night 
Hard froft and aurora borealis 
E. gentle 
29.56 
38 
Of D 
Pofitive 
D° 
Ditto, no ftronger than before. 
26. 1 1 mowing 
Clear froft 
N. gentle 
29-5 
3 8 
of D 
Pofitive 
D° 
Ditto ; a ftrong bottle was this day tried, which appeared to colled as well as any. 
Doubled., 
26. 4 palt 8 at night 
Beginning to fnow 
N.E. brifk 
29-5 
37 
of D 
Pofitive 
Umbrella 
27. 1 1 morning 
Cloudy and likely to fnow 
N.E. gentle 
29.2 
35 
of D 
Pofitive 
Torch and bottle 
Plate once lifted up. 
28. 10 morning 
Snowing 
S.E. ftrong 
28.8 
28 
of D 
Negative 
Umbrella and torch 
Ditto. 
28. 40 min. paft 12 noon 
Snowing very little 
S.E brifk 
28.5 
28 
of D 
Pofitive 
Torch and bottle 
Doubled. 
28. II at night. 
Fair, but over- call 
S. gentle 
29.06 
37 
0 
Pofitive 
D° 
Plate once lifted up; divergency of the leaf gold very great. 
Ditto, but weaker. 
29- IO morning 
Small rain and mift on the hills 
S. brifk 
29.06 
3 8 
3 fM 
Negative 
D° 
29. § paft 10 morning 
Rain ceafed 
D“ 
29 06 
3 8 
3 £M 
Pofitive 
D° 
Four times doubled. 
29. 3 afternoon. 
Few drops of rain 
S. ftrong 
29.06 
41 
5 *M 
Pofitive 
D° 
Plate once lifted up. 
30. 45 min. paft 10 morning 
Fair, but over-caft 
S. ftrong 
29.45 
44 
6f M 
Pofitive 
D° 
Ditto. 
3O. 11 morning 
D 3 
D’ 
29.44 
46 
7 fM 
Pofitive 
D° 
Ditto; the hygrometer was higher than known during above three years. 
31. 10 morning 
Fair and clear. 
S.W. gentle 
29 55 
44 
3 f M 
Pofitive 
D° 
-r\ • ^ * 
Ditto. 
Feb. I. 9 morning 
Thick mill with fine drops of rain 
Calm 
29-53 
46 
2|M 
Pofitive 
Umbrella and torch 
Three times doubled. 
1. 1 1 morning 
Thick mift 
S.W. gentle 
D u 
D° 
D" 
Pofitive 
Kite 
Strong fparks were produced from a Hiring 260 yards long, with brafs wire in it. 
2. 1 1 morning 
Thick mift 
S.W. gentle 
29.4 
44 
if M 
Pofitive 
Torch and bottle 
Plate once lifted up, very ftrong. 
3. 10 morning 
Heavy clouds 
S.W. brifk 
29.2 
46 
3 IM 
Pofitive 
D° 
Ditto, alfo very ftrong. 
3. | paft 1 1 morning 
4. 8 morning 
Small rain 
Clear and frofty 
S.W. ftrong 
Calm 
D° 
29-3 
D° 
42 
D° 
of D 
Negative 
Pofitive 
Umbrella 
Torch and bottle 
Twice doubled; a few minutes after the torch was tried, when the rain had ceafed, and a much ftronger pofitive was produced. 
Plate once lifted up. r 
5, 4 paft -io morning 
Thick mift on the hills 
S.E. gentle 
29.26 
3 8 
Of M 
Pofitive 
D° 
Ditto, ftrong. 
6. 10 morning 
Thick mift and few drops of rain 
S. gentle 
29 12 
40 
1 M 
Pofitive 
D° 
So ftrong as twice to ftrike the fides of the electrometer, and fenfible without the plates. 
Plate once lifted up. 
7. § paft 10 morning 
Cloudy 
S.W. brifk 
28.7 
46 
5? M 
Pofitive 
D° 
7. \ paft 2 afternoon 
Small rain 
S.W. brifk: 
28.69 
47 
4 i M 
Negative 
Umbrella 
Ditto. 
8- A paft nine morning 
Clear and frofty 
Calm 
29.28 
40 
of M 
Pofitive 
Torch and bottle 
Ditto. 
9. 12 noon 
Cloudy after rain 
S. ftrong 
28.75 
46 
4 m 
Pofitive 
D° 
Ditto. 
9. \ paft 1 afternoon 
Rain 
S. ftrong 
28.68 
46 
4 *M 
Negative 
Umbrella 
Ditto. i 
IO. 9 morning 
Rain 
S. gentle 
28.64 
44 
if M 
Negative 
Umbrella 
Ditto. 1 
11. 12 noon 
Beginning to rain 
S. brifk 
28.34 
42 
2 M 
Negative 
Torch and bottle 
Ditto. 
12. 12 noon 
Fair, with heavy clouds 
S. ftrong 
27.8 
44 
2| M 
Pofitive 
D° 
Ditto. 
13. | paft 9 morning 
14. and 15. abfent. 
Veryfmall rain, thin clouds 
N.W. brifk 
28.1 
" 44 
ifM 
Negative 
D° 
Ditto j 10 minutes after the rain ceafed the electrometer was weakly negative, and 5 minutes after that ftrongly pofitive. 
16. IO morn. 
Small rain 
S.W. gentle 
28.83 
47 
3 i M 
Negative 
D° 
Ditto. 
17. IO morning. 
Very few thin clouds 
W. gentle 
29.42 
44 
0 
Pofitive 
D° 
Ditto. 
18. I afternoon 
Few white clouds 
W, brifk 
29 42 
48 
1 M 
Pofitive 
D 3 
Ditto. 
19. 1 1 morning 
Few diftr.nt clouds 
N.W. gentle 
29 53 
47 
ifM 
Pofitive 
D° 
Ditto. 
20. 1 1 morning 
Over-caft 
N. gentle 
29.47 
46 
IfM 
Pofitive 
D° 
Ditto. 
21. 3 afternoon 
Heavy clouds 
N. gentle 
29.42 
47 
ifM 
Pofitive 
D° 
Ditto. 
22. 1 1 morning 
Few white clouds 
N.E. gentle 
29.4 
40 
of D 
Pofitive 
D° 
Ditto. * 
23. \ paft IO morning 
Over-caft 
E. brifk 
29.38 
40 
if D 
Pofitive 
D° 
Ditto. 
24. IO morning 
Clear and frofty 
S.E. gentle 
29.32 
42 
of D 
Pofitive 
D° 
Ditto. 
25. 4 paft 12 noon 
Few clouds 
N.W. ftrong 
29 23 
46 
1 M 
Pofitive 
Lantern 
Juft fenfible to the electrometer, without the doubler. 
25 - \ paft 10 morning 
27. mentioned afterwards 
Clear 
S. gentle 
2 9-3 
45 
of D 
Pofitive 
Lantern 
More fenfible, the lantern being elevated fifteen feet high. j 
28. \ paft 12 afternoon 
Few white clouds 
W. ftrong 
29.07 
48 
0 
Pofitive 
Lantern and bottle 
Four times doubled. » 
Mar. 1. 2 afternoon 
Few drops of rain 
S.W. ftrong 
28.68 
5 ° 
3 * M 
Negative 
Umbrella 
Often doubled; a few minutes after rain ceafed, and the ele&rometer became pofitive. 
2. IO morning 
Small rain. 
S.W.very ftrong 
28.35 
47 
4 f M 
Negative 
Umbrella and torch 
Plate once lifted up. 
JS T . B. The thermometer and hygrometer were placed where they were not likely to be altered by accidental heat. 
fixed up three years and upwards, during which time its index has moved within the fpace of 
Vol. LXXVIL 
The hygrometer confifted of fifteen feet of whipcord, fufpended horizontally : it has been 
4 inches, which is therefore divided into inches and eighths, moift and dry. 
U u 
