HOW FAILURE UNDER STRESS OCCURS IN TIMBER. 435 
ASH 
| I Breaking | t= 2:35WL c= 75WL Piste 1 cee Horizontal 
; i : baz ba? ormula, | bd orizonta 
Spec. No. | Span. b. d. ih poegm Tons Tons t=ce=15 VL) Tons Shear. 
; per sq. in, per sq. in. bd? | per sq. in. 
121 | 18 1°85 | 3-45 | 5-2 4-7 9-05 2-88 5-76 ‘731 | Radial. 
43] 8 3°5 1:32 | 6 3711 9°6 3°06 6°12 67 % 
432 9 3°5 1:32 | 6:8 3°03 10°5 3°35 6°70 66 5 
211 14 3°62 1°65 8°5 2°83 95 3:03 6°06 ‘47 a 
122 36 1:87 3°55 | 1071 2°35 8:45 Der 5:40 36 ) 
531 36 ECE 3°52 | 10°2 2°18 8°45 2°, 5°40 *35 5 
DAO, 18 3°62 | 1:65 | 10°9 2°3 9-7 3:09 6°18 38 an 
41 36 16 oe ES 1:59 8°25 2°63 5:26 “83! 
33 36 3°62 1:65 | 21°8 98 8°45 27, 54 16 5) 
123 9 3°45 | 1°85 | 4°85 5) 9°3 2°96 5°92 83 i Tan- 
433 21 11933) || 355) 6 2°92 8:9 2°84 5°68 63 : gential. 
532 14 ea ere 7 3°25 9-7 3°09 6°18 023 5 
533 18 3°52 1:77 |1071 2°06 7-9 2°52 5°04 “B83 2 A 
213 36 165 | 3°62 | 9:95 WDM, 8:7 2°78 5°56 373" 5 
434 36 1ESZN asd) ehOss 1:77 9:25 2°95 5:70 38! me 
15 36 165 | 36 /|10 2°13 835 2°66 5 32 36 a 
31 36 3°63 | 1:65 | 21:8 1:13 9-7 3:09 6°18 19 35 
Boxwoop. 
i | Breaking | ,_1:94WL | ,_-82WL | Mastic Spee 
Spec. No.| Span. b d Swiebosimeis = pd. ul) bat a ~ bd Seoul 
Tons. Tons. Tons. t=c=1 oo Tons. nee 
(A 56 | 17 | 14 =| 4 2:66 8°7 3°67 674 1:12 | Radial. 
111 8 1:05 | 2 4 1:98 7:3 3:08 5°67 94 ie 
112 12 Od hea 6 1°49 8:25 3°48 6:40 71 5 
72 Rosk|}  1e7/ 14 6 1°95 9°55 4:04 7°40 ‘82 an 
i |. 2 1-4 |10 78 55 2°32 4:95 28 i 
113 20 1:05 | 2 10 1:15 10°6 4°48 8°23 55 5 
4 36 1:18 | 2:08 |17-3 63 8°6 3°64 6°68 | “26 3 
114 4 2 1:05 ; 3:8 3°06 10°7 4°52 8:29 1°46 Tan- 
74 68 | 1:4 1-7 4 2°86 9°35 3°95 7°25 Ie? gential, 
115 6 2 1:05 | 5:7 2°26 11:9 5:05 | 9:28 1:07 5 
75 102 | 1:4 17 6 1:03 5:05 2°14 | 3°93 43 if 
76 20 1°4 2:0 |10 1°55 10°4 4°4 8 08 "BD A 
10 36 1:14 | 2°32 | 15-5 o7/ 8:0 3°37 6:18 20 FS 
Taking the average values in each set of tests, we have :— 
When 
Horizontal Shear Oak. ASH. Boxwoop. 
is 
Tangential t= 6°88 9-0 9:2 tons 
Radial t=6°'25 9-1 84 
Tangential = ‘84 “45 ‘83 tons 
Radial s= ‘78 “45 BM op 
