370 Proceedings of the Royal Society of Edinburgh. [Sess. 
These results may be compared as follows : — 
Rectangular 
plate. 
Pressure at which 
set commences 
(practical). 
Pressure at 
which set should 
commence (from 
formula). 
8x4 
20 
13-29 
8x4 
20 
13-73 
5x4 
25 
17-62 
The experimental results are too high. The parts of a rectangular 
plate that yield first are the extremities of the shorter diameter, and 
hence the accumulation of set must be very slow. 
Graphic Analysis of Rectangular and Square Plates. 
Being satisfied that the deflection at the centre of rectangular and 
square plates practically agrees with Grashof s formula, the author decided 
to make a practical analysis for curvature for a number of these plates. 
The method employed was the same for all. The curve of deflection, after 
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