176 
The following Observations of Solar Radiation were made in the 
Indian Seas by Mr. Bards in the year 1828. 
NEW ANCHORAGE, BENGAL. 
May 24th 1828. At 12 noon, the temperature in the shade being 86°, ex- 
posed a thermometer to the sun’s rays upon a black painted board, the bulb be- 
ing covered with a piece of black woollen cloth ; at 12 30’, it stood 117°; at 12 
45’, 120°. At 23 P. M. temperature of shade being 864°, exposed the thermo- 
meter again in same manner as before ; at 3 P. M. it was 120°; at 3 30, 1283° ; 
at 3 45’, 1293°. During the day a few cumuli occasionally passed over sky, ob- 
scuring sun for a few minutes at a time. 
Shade 863°, Sun 1293°, Power of Sun 43°. 
May 25th. AtllA. M. temperature in shade 864°, exposed a thermometer 
to sun’s rays in same manner as yesterday; at 11 30’, 120°; at 12 noon, 1284° ; 
at 12 45’, 130°; at 1 P. M. 130°. A few cumuli occasionally obscured sun for 
a few minutes. Shade 863°, Sun 130°, Power of Sun 434°. 

WHAMPOA, CHINA. 
August 31st 1828. At 12.5’ noon, temperature of shade 85°, exposed ther- 
mometer as before; at 12 15’, 108°; at 12 15’, 118°; at 12 35’, 125° at 12 
45’, 131°; at 1.15’, P. M. 1374°. A few clouds occasionally for 2 or 3 minutes 
Peoting sun. 
Therm. in Shade 85°, Max of Sun 1373°, Power of Sun 522°. 
Sept. 21st. At 12.10’ noon, temperature in ihe 86°, exposed thermometer 
to sun as before ; at 12 20’, 119°; at 22 25’, 130°; at 12 30’, 137°s at 12 35’, 
140°. Sky during this time clear.—Shade 86°, Sun’s maximum 140°, Power 
of Sun 54°. 
Oct. 10th. At 12 20’, temperature in shade 70°, exposed a thermometer as 
before ; at 12 30’, 102°; at 12 40’, 114°; at 1250’, 120°; at 1 P. M. 123°. 
A fine haze extended all over sky during the whole of the day. 
Therm. Shade 70°, Sun’s maximum 123°, Power of Sun 53°. 
Nov. 9th. At 9 30’A. M. temperature in shade 74°, exposed thermometer 
as before; at 10 A.M. 98°; at 1030’, 109°; at 11 A.M. 111°; at 11 30, 
116°; at 12 noon 122°. Sky clear.—Therm. Shade 74°, Sun’s maxim. 122°, 
Power of Sun 48°. 
Nov. 18th. At 10 25’ A. M. temperature in shade 744°, er thermome- 
ter as before; at 10 35’, 96°; at 10 45’, 106°; at 11 A. M. 107°; at 11 30%, 
109°; at 11 40’, 113°; at 11 50’, 114°; at 12 noon 1172°; at 12 10’, 121°; 
12 20’ 1234°. Sky clear. 
Therm; Shade 743°, Max. of Sun 1234°, Power of Sun 49°. 
If we compare these seven observations, made in about 23° N. Lat. with seven 
of those made in a former voyage, as registered in the preceding table, we shall 
find the mean of the above seven to be 49°, (Power of Sun;) while those made 
nearer the equator, (from 9° 23’ S. Lat. to the equator, or rather to 1° 07’ N 
Lat.) give as the mean 58° 6’, pone an excess in favour of those made near the 
line, of 9° 6’. . oe 
