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ARCH BRICK WORK

181

FORMULAS AND TABLES FOR ARCH BRICK— Continued
Firebrick Arches; Rise, Length, Radius, for Chord of Unity

No.l
	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 6 log c
	r or r'
	logr logr'

0.1667 0 1697
	9.22185 9.22975
	2
	73-44-08
 75-QO-OQ
	1.07254 1 07511
	0.03042 0 03145
	0.8334 0 8213
	9.92084 9 9145^

0 1700
	9.23045
	
	75-00-44
	1 07537
	0 03156
	0 8203
	9 91397

0.1719 0.1750 0.1771 0 1800
	9.23521 9.24551 9.24818 9 25527
	2-h 21
	75-53-30 77-09-36 78-01-12 79-11-44
	1.07702 1.07977 1.08165 1 08428
	0.03222 0.03333 0.03409 0 03514
	0.8131 0.8018 0.7943 0 7844
	9.91015 9.90406 9.90001 9 89456

0.1823 0.1850 0.1875
 0 1882
	9.20077 9.26717 9.27300 9 27459
	2&
 21
	80-07-39 81-13-04 82-13-27 82-30-00
	1.08639 1.08890 1.09126 1 09193
	0.03599 0.03699 0.03793 0 03819
	0.7768 0.7682 0.7604 0 7583
	9.89033 9.88546 9.83105 9 87986

0 1900
	9 27875
	
	83-13-38
	1.09365
	0.03888
	0 7529
	9 87673

0.1927 0.1950 0.1970 0 2000
	9.28490 9 .29003 9.29648 9 3010<'
	2ft
 2|
	84HL3-17 85-13-23 86-22-29 87-12-20
	1 .09625 1.09850 1.10137 1.10347
	0.03991 0.04080 0.04233 0.04276
	0.7456 0.7385 0.7306 0 7250
	9.87253 9.86837 9.86367 9.86034

0.2081 0 2050
	9.3077C 9 3117f
	2&
	88-27-14 89-26-10
	1.10660 1.10855
	0.04399 0.04476
	0.7169 0.7106
	9.85543 9.85164

0 2071
	9 3161<
	
	90-00-00
	1.11072
	0.04560
	0.7072
	9.84949

0.2083 0 2100
	9.31876 9 32222
	2|
	90-29-34 91-41-32
	1.11196 1.11374
	0.04605 0.04680
	0.7041 0.6969
	9.84762 9.84315

0.2135 0.2188 0 2200
	9.3294< 9.3399
 9 3424*
	2&
 2|
	92-29-24 94-32-12 94-59-5^
	1.11743 1.12312
 1.12444
	0.04822 0.05043 0.05094
	0.6922 0.6807 0.6782
	9.84025 9.83295 9.83135

0.2240 0 2265
	9,3501 9 3551
	2«
	96-29-13 97-30-OC
	1.12885 1.13168
	0.05264 0.05372
	0.6703 0.6650
	9.82624 9.82284

0.2292 0 2300
	9.3601 9 3617
	2f
	98-30-0 98-48-3
	1.13466 1.1355
	0.05487 0.05521
	0.6600
 0.6585
	9.81953 9.81854