690 MR. FAIRBAIRN’S EXPERIMENTAL INQUIRY 
Table VL Strength of riveted Plates. — Yorkshire Iron*. 
No. 
of 
exp. 
Description of plates 
and mode of riveting. 
Weight 
laid on 
in lbs. 
Changes produced 
by weights. 
Breaking 
weight in lbs. 
Form of specimen and mode 
of fracture. 
Remarks. 
21 . 
22 . 
23. 
Plates 22 inches 
thick, overlap joiiits, 
two rivets half-inch 
diameter, lap 1^ inch, 
AB = 3 inches, riveted 
bythepatent machine. 
Same as last, area 
44 in. 
Pig. 4. 
20,01 1 ■ 
21,703. 
Q 
Q 
< 
# 
Q 
3 
( 
\ 
f 
A 
Q© 
B 
( 
V 
O 
Q 
Q 
© 
( 
Torn across at the rivet-holes. 
Kivet-holes torn out. 
Kivet-holes torn out. 
24. 
Plates as before, ri- 
veted by the hammer, 
the rivets half-inch di- 
ameter, being of the 
usual length, hut ra- 
ther shorterthan those 
used for the machine. 
25. 
14,839 
15,343 
Plates bent. 
16,099j 
Specimen same as be- 
fore, fig. 4. 
Rivet-heads broke off and the plate 
torn across them in consequence. 
Rivet-heads cracked across and 
rivet-holes torn out. 
26. 
Plates same as be- 
fore and riveted by the 
hammer, with half- 
inch rivets, the rivets 
being a little longer 
and 2 inches lap ... 
27. 
14,839 
14,839 
Plates bent nearly 
into a dh’ect line 
mth straining force. 
Specimen same as be- 
fore, fig. 4. 
Here the rivets were the same 
length as the machine rivets, expe- 
riments 1, 2, 3, and were worked 
with great care on both sides. 
Both rivet-heads broken and the 
plate torn across them. 
Torn across at rivet -holes, and 
one rivet-head split. 
28. 
Plates same as be- 
fore, lap 2 inches, and 
the rivets the same as 
in the last experiment, 
but riveted by the ma- 
chine 
29. 
14,839 
18,667 
Plates bent into 
a direct line by the 
straining force. 
Joint apparently 
sound. 
Specimen same as be- 
fore, fig. 4. 
Both rivets cracked across, metal 
torn across the rivet-holes. 
Torn across at the rivet-holes, 
both rivets slightly cracked near the 
head. 
The plates used in the foregoing experiments are of Yorkshire iron, the same as 
those employed in Tables I. and II. The specimens were prepared in the same manner 
and of the same thickness, but 1 inch wider at the joint. This was done in order to 
retain sufficient metal round the rivet-holes, making the breadth of the plate the 
same after the rivet-holes were punched out as that of the plates torn asunder in the 
preceding experiments. In all these experiments only two half-inch rivets were used 
in the breadth of the plate. The lap was however increased, after the three first ex- 
periments, from to 2 inches, to give greater strength in the longitudinal line of 
the plate and to prevent the metal tearing in that direction. This precaution was 
* The nature and appearance of the fractures of all the irons and their riveted joints are shown in Plate LVII. 
