TABLE FOR USE IN DESIGNING RADIAL TYPE BRICKS

No of brick to Circle
(1)

Sine of Half Angle
(2)

Dia. for 9 ” Chord in inches
(3)

No of brick to Circle
(1)

Sine of Half Angle
(2)

Dia. for 9”Chord in inches
(3)

5
6
7
8

.58779
.50000
.43388
.38268

15.312
18.000
20.743
23.518

53
54
55
56

.05924
.05815
.05709
.05607

151.924
154.772
157.646
160.514

9
10
11
12

.34202
.30902
.28173
.25882

26.314
29.124
31.945
34.773

57
58
59
60

.05508
.05414
.05322
.05234

163.399
166.236
169.109
171.953

13
14
15
16

.23932
.22252
.20791
.19509

37.607
40.446
43.288
46.133

61
62
63
64

.05147
.05065
.04985
.04907

174.869
177.690
180.524
183.411

17
18
19
20

.18375
.17365
.16459
.15643

48.980
51.681
54.681
57.534

65
66
67
68

.04832
.04758
.04668
.04618

186.253
189.155
192.020
194.890

21
22
23
24

.14904
.14231
.13616
.13053

60.386
63.242
66.099
68.950

69
70
71
72

.04552
.04486
.04423
.04362

197.715
200.624
203.482
206.327

25
26
27
28

.12533
.12054
11609
.11197

71.810
74.664
77.526
80.379

73
74
75
76

.04302
.04244
.04188
.04132

209.205
212.064
214.900
217.812

29
30
31
32

.10812
.10453
.10117
.09802

83.241
86.100
88.959
91.818

77
78
79
80

.04079
.04027
.03975
.03926

220.642
223.491
226.415
229.241

33
34
35
36

.09506
.09227
.08964
.08716

94.677
97.540
100.402
103.258

81
82
83
84

.03878
.03830
.03784
.03739

232.078
234.987
237.844
240.706

37
38
39
40

.08481
.08258
.08047
.07846

106.120
108.985
111.843
114.708

85
86
87
88

.03695
.03652
.03610
.03569

243.572
246.440
249.307
252.171

41
42
43
44

.07655
.07473
.07299
.07134

117.570
120.434
123.305
126.156

89
90
91
92

.03529
.03490
.03452
.03414

255.030
257.880
260.718
263.620

45
46
47
48

.06976
.06825
.06680
.06540

129.014
131.868
134.731
137.615

93
94
95
96

.03377
.03341
.03306
.03272

266.509
269.380
272.232
275.061

49
50
51
52

.06407
.06279
.06159
.06038

140.471
143.335
146.199
149.056

97
98
99
100

.03238
.03205
.03173
.03141

277.949
280.811
283.643
286.533