385 
1911-12.] The Elastic Strength of Flat Plates. 
Dr Dougall for their kindness in informing him of the latest phases of 
mathematical research on the subject ; to Professor Morley for the loan of 
literature relating to the subject ; and to Dr Bach of Stuttgart for the 
results of some of his tests on large riveted plates. 
The author wishes also to record his thanks to Mr F. C. Forth, 
A.R.C.Sc.I., Principal of this Institute, for the kindly and sympathetic 
interest he has taken in what has proved to be a prolonged and laborious 
investigation. 
Table I. — Circular Plates — Deflections. 
The tabulated numbers are the pressures (lb./in. 2 ) and corresponding deflections at 
various points along a diameter of one brass and two mild steel plates of dimensions as 
shown, all lengths being in inches. 
Brass Plate, Diameter 6", Thickness 
Pressure. 
Deflections at points measured from the centre 
21 
H- 
i 
0. 
3 
4* 
1*. ! 
st 
10 
•002 
•004 
•006 
•007 
•007 
•004 
•002 
20 
•002 
•004 
•ooo 
•013 
•on 
•006 
•003 
25 
•003 
•010 
•014 
•017 
•015 
•on 
•004 
30 
•005 
•013 
•017 
•019 
•017 
•012 
•005 
Deflections at points measured from circumference toward centre 
_3_ 
3 
9 
3 
16- 
16- 
4* 
30 
•ooo 
•001 
•003 
•004 
Mild Steel Plate, Diameter 6", Thickness 
Pressure. 
Deflections at points distant from the centre 
2J. 
2. 
1$. 
1 . 
A. 
0 . 
30 
•0025 
•004 
•006 
•0065 
•007 
■008 
60 
•0025 
•0045 
•008 
•0115 
•012 
•012 
80 
•0035 
•0095 
•0155 
•019 
•023 
•024 
100 
•0045 
•0105 
•018 
•0235 
•030 
•030 
Mild Steel Plate, Diameter 6 A 
', Thickness pg-". 
Pressure. 
Deflections at points distant from the centre 
2 ± 
2. 
H- 
1 . 
i 
2* 
0 . 
50 
•ooo 
•ooo 
•002 
•002 
•003 
•003 
70 
•ooo 
•001 
•003 
•005 
•005 
•005 
90 
•001 
•002 
•004 
•006 
•006 
•006 
100 
•001 
•0025 
•005 
•006 
•007 
•008 
130 
•0015 
•0035 
•0065 
•010 
•0105 
•0105 
150 
•0015 
•005 
•0095 
*012 
•0135 
•0140 
VOL. XXXII. 
25 
