ioS 



POPULAR SCIENCE MONTHLY 



A Contrast in Construction. 



decrease in width and depth of the Bristol Channel the tide enters the 

 Severn with great force, forming a tidal wave or bore which at times 

 attains a height of nine feet and has on several occasions caused great 

 destruction, as in 1606, 1687, 1703 and 1883. The Bristol Channel 

 also concentrates the great wave which gives Chepstow and Cardiff a 

 tidal range which sometimes reaches fifty feet. In like manner, the 

 tides which enter the Bay of Fundy between Novia Scotia and New 

 Brunswick are more and more cooped up and rise higher as they 

 ascend the strait, till they reach a height of seventy feet. But these 

 changes are gradual, not really sudden enough to constitute a properly 



