BOILERS FOR STATIONARY ENGINES.
33
Tensile Strength of Single and Double Rivetted Plates.
Cohesive Strength ofPlates.
Breaking Stress in Lbs.per Square Inch.
Strength of Single RivettedJoints, of equal Sectionto the Plates, taken throughthe Line of Rivets.
Strength of Double RivettedJoints, of equal Sectionto the Plates, taken throughthe Line of Rivets.
57.724
45.743
52,352
61.579
36,606
48,821
58,322
43.141
58,286
50.983
43.515
54,594
51.130
40,249
53,879
49,281
44,715
53,869
43.805
37,161
47,062
Mean, 52,485
41,59c
53,633
Area of boiler stays = where A=area of surface of plate
held by one stay, and p and t being the pressure and tenacity re-spectively.
The following value of plates may be fairly assumed with those
of joints:—
Plates. ioo
Double Rivetting. 70
Single Rivetting. 56
In a series of experiments by Napier the tensile strength of ironplates averaged from 56,735 to 41,743 lbs. per square inch.
Weight of a Square Foot of Wroitght-iron Plate from to l inch in Thickness .
Thicknessin inches.
Weightin lbs.
Thickness.
Weight.
1
T2
1-25
i + A
21-25
nr
2 '5
TT
22*5
i 1 1
TT-TTT
375
TT + UT
2 3 75
$
5'
5
H
2 5’
1 + tV
6-25
5 1 1
26-25
7'5
TT
2 7'5
3 r 1
TT + 'ST
875
11 4. 1
TT ' "5T
28-75
4,
IO*
3°'
1 1 1
? T -3-ff
II *25
T + T5T
31 ' 2 5
5
TT
12-5
TT
32-5
5 1
T 7 T + - 3 T
1375
TT + UT
3375
s
15’
T
35‘
T + TT
16-25
T “r TT2
3 6 ' 2 5
TT
I7-5
1 5
Tö
37'5
nr + tt
1875
TS + TT
38 7 5
20 *
I
4 o-
Weight of Angle Iron , in Lbs. per Lineal Foot .
Breadth in inches. IX, iX> iX> 2 , 2 X 2 X, 2 X> 3 . 3 /C> 3 %-
Weight per foot in lbs. I‘8, 27, 3'3, 3-9, 5, 6-5, 83, io'4, 117, 14.