L. Loomis—Barometric Gradient in great storms. 445 
duced to their equivalent values in miles per hour by means of 
the table prepared under the direction of the Council of the 
London Meteorological Society and published in 1881. Ac- 
cording to this table the values of the numbers employed in 
the English scale (0-12) are as follows: 
M , 
Foree.} per head. Mean. |} Force. jer hear: Mean. ||Force. oe te: Mean. 
0 0 to 5 2°56 5 26 to 30 28°0 10 61 to 69 65°0 
1 6. +10 8-0 6 Shs) SSG nea 0 2 B04 Te 
2 re Rae 9 13°0 7 31) a4 40°5 12 | Above 80 90°0 
3 16,..%) 20 1870 8 45° 52 8" 
4 SL SG 23°0 9 ba" ‘GO 56°5 
The average values of the numbers upon the scale 0-6 are 
hence determined to be as follows: 
Miles Metres Miles Metres 
Force. per hour. per second. ||/Force. per hour. per second. 
1 10°5 4°69 4 44°5 19°89 
2 20°5 9°16 5 60°75 27°16 
3 30°75 13°15 6 82°5 36°88 
the distance from the center of the high area. The average 
diameter of the first isobar about the low center was 3°78 de- 
grees; and the average diameter of the first isobar about the 
high center was 4°11 degrees. The distances in column 9th 
are expressed in myriameters. The average latitude of the 
centers of low barometer employed in constructing this table is 
58°°8; and the average latitude of the centers of high barom- 
eter is 49°-7, In computing the gradient for the different 
heights of the barometer, it was assumed that in going from 
Proportional to the distance passed over. Upon this principle 
were computed the numbers in column 10th which represent 
