694 
MR. FAIRBAIRN’S EXPERIMENTAL INQUIRY 
points in contact, the lap was increased and a third rivet introduced to keep down 
the ends of the plates. 
The sketches in the 31st experiment, Table VIL, and those in the 34th and 35th 
expei'iment. Table VIII., represent the form of joint, and the methods adopted for 
securing- the plates in the direct line of the strain. 
On comparing- the breaking- weights, it will be seen that the increased lap, with a 
rivet to keep down and retain the ends of the plates, gives a considerable aceession 
of strength, and exhibits several important facts in connection with the construction 
of vessels exposed to severe pressure. But this beeomes more apparent in the forth- 
coming- experiments on the double-riveted joints. 
Table IX. Strength of riveted Plates. 
Description of plates 
and mode of riveting. 
Weight 
laid on 
in lbs. 
Changes produced by 
weight. 
Breaking 
weight in lbs. 
Form of specimen and 
mode of fracture. 
Remarks. 
36. 
37. 
Double-riveted 16,115 
plates ■22 inch thick ; 
overlap joints riveted 
with five rivets of 
f inch diameter each ; 
lap 2 inches; AB=3| 
inches in breadth ... 21,715 
Plates the same as 
before, except that! 
AB=2^ inches in' 
breadth 18,667 
Plates hent in a right 
line between the points 
of tension. 
Little or no alteration. 
line, as before. 
24,043 "I 
Fig. 9. 
O Q 
Meat 
22,53 
A 
O Q 
OQQ 
J 
B 
O Q 
Torn right across at the three 
rivet-holes, all the rivets being 
sound after fracture. 
( ) 
( ,) 
Broke as before; rivets aU 
sound. 
In these experiments, as in those in the preceding Table, the area of the rivets is 
in excess, and hence follows rupture through the plates. 
Table X. Strength of riveted Plates. &c. 
No. 
of 
exp. 
Description of plates 
and mode of riveting. 
Weight 
laid on 
in lbs. 
Changes produced by 
weight. 
Breaking 
weight in lbs. 
Form of specimen and 
mode of fracture. 
Remarks. 
38. 
“ Jump Joints.” 
14,839 
Bent into straip-htline. 
Fig. 10. 
Tore across the rivet-holes. 
Plates the same as he- 
G 
Q 
( 
) 
fore, both riveted to 
an extra plate of the 
19,627 
All sound. 
w 
Rivets sound after fracture. 
same thickness laid on 
G 
) 
) 
one side of them ; lap 
21,691 
Rivets sound; plates 
23,37n 

of extra plate over 
much bent. 
each end 2 inches ; 
each plate riveted hy 
o 
A 
B 
five rivets f inch dia- 
CO* 
o o 
meter ; AB = 3iinches. 
h 
V 
39. 
Same as above 
18,667 
Bent nearly into a 
O 
straight hne. 
> ( 
□ 
c 
22,699 
Rivets sound; joint ap- 
24,043 
Tore across as before; one 
parently good. 
c 
rivet-head crooked. 
The same observations will apply to these experiments as to the last ; the area of 
the rivets is in excess of that of the plates. 
