242 
Mr William Galbraith on the Tides. 
near the mouth of the Ganges, after the hurricane had ceased to blow 
from the southward into the Bay of Bengal. 
It also caused, on the 
low grounds in the vicinity, the destruction of much life and property. 
These catastrophes are greatly to be dreaded in tropical climates, be- 
cause they cannot be foreseen, so as to be avoided. 
It is fortunate 
for us, however, that they can scarcely ever occur in our temperate 
climates, though it would be well to be apprized of the utmost limits 
to which they can attain. 
Logarithms to compute the height of Spring Tides, the mean being 
represented by unity. 
Semidiame- 
ter. 
Log. for Sun, 
or Log. a. 
9°36785 
9°37473 
9°38157 
9°38837 
9°39514 
9°40187 
9°40857 
Difference 
——— — | — | ———_—_ 
| 
_ oo EEE 
Log. for Moon, 
or Log. b. 
9-78267 
9°79010 
9°79748 
9°80482 
9°81212 
9°81938 
9-82660 
9°83377 
9°84091 
9°84801 
9-85507 
986210 
986908 
9-87603 
9:88294 
9 88982 
9°89666 
9°90346 
9°91023 
9-91696 
9°93033 
9'93696 
9°94356 
9°95012 
9:95665 
9:96315 
Difference 
9°92366 
to 1” 
148°6 
147°6 
146°8 
146-0 
145:2 
144-4 
143°4 
142°8 
142°0 
141°2 
140°6 
139°6 
139°0 
138°2 
1376 
136°8 
136:0 
135°4 
134°6 
134°0 
