ARCH BRICK WORK
179
FORMULAS AND TABLES FOR ARCH BRICKContinued
Firebrick Arches; Rise, Length, Radius, for Chord of Unity
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
No. 7
No. 8
Rise or Middle Ordinate Decimal of Span or Chord
Logarithm of Rise or Middle Ordinate
Rise or Middle Ordinate Inches per 1 Ft Span or Chord
Arc
Length of Arc
Logarithm of Length of Arc
Radius of Arc
Logarithm of Radius of Arc
V
log v
V
a, Degrees,
Minutes and Seconds
b or c
log& logc
r or r'
logr logr'
0.0703 0.0729 0 0750
8.84703 8 . 86283 8 . 88081
ft
7 8
32-00-48 33-06-09 34-07-23
1.01313 1.01410 1 . 01493
0.00567 0.00608 0 00644
1.8132 1.7552 1 7042
0.25846 0.24432 0 23151
0.0755 0.0781 0 0800
8.87807 8.89279 8 90309
»
It
34-20-50 35-30-42 36-21-42
1.01513 1.01618 1.01698
0.00652 0.00697 0 00731
1.6934 1.6396 1 6025
0.22875 0.21473 0 20479
0.0807 0 0820
8.90703
8 91672
»
36-40-23 37-30-00
1.01728 1.01807
0.00728 0 00778
1.5893 1 5555
0.20120 0 19187
0.0833 0.0850 0.0859 0.0885 0 0900
8.92082 8.92942 8.93418 8.94714 8 95424
1
1& 1*
37-50-04 38-35-32 38-59-32 40-08-58 40-49-03
1.01841 1.01916 1.01956 1.02075 1 02146
0.00742 0.00824 0.00841 0.00892 0 00922
1.5422 1.5131 1.4982 1.4567 1 4339
0.18815 0.17986 0.17656 0.16336 0 15652
0.0911 0.0938 0 0950
8.95974 8.97197
8 97772
1*
11
41-18-14 42-30-03 43-08-26
1.02197 1.02329 1.02389
0.00944 0.00999 0.01025
1.4177 1.3795 1.3663
0.15158 0.13973 0.13355
0.0984 0.0990 0 0995
8.98387 8.99545 8 99763
1* 1*
43-39-42 44-47-58 45-00-00
1.02460 1.02593 1.02617
0.01055 0.01112 0.01122
1.3446 1.3121 1.3066
0.12858 0.11797 0.11613
0 1000
9 00000
45-14-23
1.02646
0.01134
1.3000
0.11394
0.1016 0.1042 0 1050
9.00673 9.01773 9 02119
1* U
45-56-36 47-04-35 47-26-20
1.02731 1.02871 1.02914
0.01170 0.01229 0.01247
1.2811 1.2520 1.2430
0.10760 0.09761 0.09446
0.1068 0.1094 0 1100
9 . 02845 9.03892 9 04139
1* 1ft
48-13-44 49-16-16 49-37-47
1.03015 1.03162 1 . 03196
0.01290 0.01352 0.01366
1.2238 1.1995 1.1914
0.08771 0.07900 0.07604
0.1120
9.04914
1»
50-30-12
1.03312
0.01415
1.1721
0.06895