230 THE REV. W. WHEWELL ON THE RESULTS OF CONTINUED TIDE 
Additional Note on the Tides of the Bristol Channel. 
Mr. Ross has traced the modification which the semimensual inequality of heights 
undergoes in ascending the Bristol Channel from Pembroke to Bristol. This modi- 
fication is shown in the accompanying figure. It appears from the diagram which 
01 23 456 789 10 11 12 
Mr. Ross has drawn from the observations, that the difference of springs and neaps 
increases gradually from Pembroke to Llanelly, Weston, Cardiff, and finally Bristol, 
the diflference being 5 ft. 6 in. at the first place, and 10 ft. 6 in. at the last; and the 
curve which represents the change from day to day being at all the places of the 
same form, namely, of the form described in the preceding paper. 
W. W. 
Trinity College, Cambridge, 
Nov. 3, 1849. 
Table A. — Results of Tide Observations arranged according to the amount of 
excess of Springs above Neaps. 
Table B. — Places along the same coasts arranged in the order of their “ Establish- 
ment.” 
