82 STRESSES ON VESSELS OF THE GREAT LAKES, ETC. 
With the reference to the sections through the hatches, of course, there is no such thing 
as a section through a hatch in a lake type vessel. Mr. Arnott must be aware of that. The 
only deck we have on a lake vessel is the stringer plate on each side. There is no other deck 
on the ship, and there is no section through the hatches. In fact the ship consists of prac- 
tically one hatch, and therefore no further concessions on draught would be allowed, as sug- 
gested in the British Report for Ocean Ships. 
In regard to Admiral Taylor’s remarks, I think his explanation as to waves is undoubt- 
edly correct. It is not necessarily due to the fact that the water is shallower that we get the 
steeper wave. 
I might add, in conclusion, that the captains of a number of the Great Lakes vessels 
took a large number of observations. They cooperated with us in the best possible way, and 
we drew up a series of suggestions for them as to how they should observe the heights and 
lengths of waves, and in some cases they were very careful in their observations. The longest 
waves observed, as I mentioned in the paper, 400 feet, were unfortunately taken by one ob- 
server only, and when you figure the speed of a wave 400 feet it is easy to make mistakes tc 
the extent of 100 feet, if you miss the passage of time when that wave is on the crest by one 
second. 
THE PRESIDENT :—Gentlemen, I am sure you all wish me to extend the thanks of the 
Society to Professor Sadler and Professor Lindblad for this very valuable contribution to 
the records of the Society, and I take pleasure in so doing. 
This concludes the morning session. We will take a recess until 2.45 o'clock this 
afternoon. 
The meeting then adjourned. 
