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182                                      APPENDIX VI

FORMULAS AND TABLES FOR ARCH BRICK—Continued
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
	logv
	V
	a,     ' Degrees, Minutes and Seconds
	6 or c
	log b log c
	r or rf
	logr logr'

0.2344 0.2396 0 2400
	9.36991 9.37946 9 38021
	2tt
 2J
	100-28-08 102-24-54 102-33-50
	1 . 14061 1.14667 1 14714
	0.05714 0.05944 0.05962
	0.6505 0.6415 0 6408
	9.81323 9.80720 9 80675

0.2448 0 2465
	9.38880 9 39195
	2«
	104-20-44 105-00-00
	1 . 15284 1 15621
	0.06177 0 06304
	0.6330 0 6302
	9.80142 9 79950

0.2500 0.2600 0.2604 0.2673 0 2700
	9.39794 9.41497 9.41567 9.42693 9 43136
	3 3|
	106-15-36 109-53-51 110-04-25 112-30-00 113-28-34
	1.15912 1.17150 1 . 17200 1.18072 1 18429
	0.06413 0.06874 0.06893 0.07215 0 07346
	0.6250 0.6108 0.6101 0.6013 0 5980
	9.79588 9.78588 9.78541 9.77912 9 77667

0.2708 0.2800 0.2813 0 2821
	9.43270 9.44716 9.44909 9 45041
	34-
3S
	113-45-36 117-25-40 117-26-54 120-00-00
	1.18533 1 . 19746 1 . 19920 1 20027
	0.07384 0.07826 0.07889 0 07928
	0.5970 0.5851 0.5850 0 5774
	9.77597 9.76722 9.76717 9 76144

0.2900
	9 46240
	
	120-30-04
	1.21102
	0 08315
	0 5759
	9 76035

0.2917 0 3000
	9.46489 9 47712
	3i
	121-02-15 123-51-18
	1.21336 1 22495
	0.08399 0 08812
	0.5744 0 5667
	9.75919 9 75333

0 3100
	9 49136
	
	127-08-33
	1 23926
	0 09316
	0 5584
	9 74691

0 3109
	9 49265
	
	127-30-00
	1 24059
	0 09363
	0 5575
	9 74624

0.3125 0 3200
	9.49485 9 50515
	3f
	128-01-18 130-28-37
	1.24289 1 25391
	0.09443 0 09827
	0.5563 0 5506
	9.74527 9 74086

0 3300
	9 51851
	
	134-19-16
	1 26892
	0 10343
	0 5425
	9 73443

0.3333 0.3341
	9 . 52288 9.52386
	4
	134-^5-44 135-00-00
	1.27395 1 27517
	0.10515 0 10557
	0.5417 0 5412
	9.73373 9 73335

0 3400
	9 53148
	
	136-51-46
	1 28428
	0 10866
	0 5377
	9 73050

0 3500
	9 54407
	
	139-58-05
	1 29997
	0 11393
	0 5321
	9 72603

0.3541 0.3600
	9.54921 9.55630
	4i
	141-13-56 142-14-08
	1.30650 1 31599
	0.11611 0 11925
	0.5301
 0 5284
	9.72431 9 72299