and Poissons Ratio for Sj. 



mice. 



875 



These were obtained on the assumption that the properties 

 obeyed the laws of probability, and Peter's formula * was 

 used to calculate them. 



Table I. 



PratuUc 

 variation 



MX 



Exp: 



Mo. JDoanfeiJi 

 Of dr,fc4 



dry 



EzpfelifacjbSin 



w 



l\f^ 



JUcbfe PraAnlFWfcSW, 



^ferttrfj mean' 





Limit" Ivanvfo 



PrfatltfU 



Ibaperjfrom Ib-ipJfWi 

 &J. in.lmBin^|3i).in j.Ticiin J / = 



22:3 -105 



50-3 



£7-3 



178 



1£5 1 1££ 



67 



8-6 



165 



170 



040 13o 



15-0 1 

 87 



67|£Q4 5SJ1Q-4- 



r- 6 » 571 ' 37 £57 ' 5-801 881 1 2-95 



,1£ 



4-5 



6-6 :1 8£ I 4- 



14-5 



i-i-e 



1-80 



i-: 



140 



050 



9 I £5-0 J 3-5 



2SS, 5'0 



12-3 

 1&5 



eo7 

 134 



3-66 



58 1+84 3-6 



7=2 



303 



6-8 



118 



rs 



56 



4-8 



l£55t> 



166! 5 1 



It? 



4-' 1 O0315]gg-5I E44| 1101 825I 5iS 



±3. 



Q4£7j 5-9 303 |4O0 : 863 !5513 308 



is -: 



103 63 



85 



11-0 1 



12fl J 90 



ii-a 



57- 



£•3 



100 



353 



£70,11- 8 4-0 



i3a;ioal5-6 



130 



339 65' 



196 



305 [140 



Y-v 



60 



j 



i3-a 



£&5 53 



63 



120 4-5 



£771 



1£1 4-3 



£S0 



340 



117 62 



i«5 



£46 



£46 



765 



7S 



5a 1 117^-751 £23 



105 



130 £56 looa-50 1-8£ 



139 



19-7 



330 



174 



44-0 



342 4-9 



no vao 



183 



5H 



3-76 



£851168 £7 



11 7 9 5 

 124 i 38 



£16 



360 



£-90 538 87 W) 1 1-8 ! 333 



3:8j£35 

 170|115 



t~8 10£. 



£i5 



130 9-8 £53 



137 I 13010-35!33£17 1 



£43 



354- 



104-j 9 3 



lc8;30 £41j56 



394 



12-5 |1-8C! £4 er 



m,, 51 l&£4 55 



396 



18r2|a-35|£-06|10a 



415 



iaa 



114 

 -169 4-3|_13T 

 £03'6 : 9| 103 

 £03_75J9£3 

 16 3 1 6 a. 1 605 

 164 : 5-5; & 16 

 1-30 '4- 1 |906 



£9-01299 



0-515 : 6-9 ! 300 $r 11£G 3-r 



O0308l£0-O| 33£ lO-ojl14o|4-5 



fr-6 j £53 9-0 [893! SB 



154J0OZ27V435J £50J7 -3J101o [ 8-0 



8-7 0£901i : 7fl4rtO-0|636|4-3 



57 



4-6 



18 81 955| 7 £ 



373 1 3-0 



353 j S-fe 

 364445 



-3 36 3 9 

 4£7; 8-7 



118 1 6-9 j 939 



i-aoia-3|8-Q9 



157!6-5 I 30£ 



O013346£| 131 111^5181 9Tja73 &7~ 

 MS S 1 6-9 j 190 f 163~JJQ4 0; 64 575 

 0Da3 : a8Ql £S6| 14-6688! rO 301 



6-6 



0311! 53 131 j l£8 i 740 6-5 



423 



3O-oJ00£5i£6£! £36! lS-a'665l94jfr93 



56: 192 4-a 5311 53 



0317. 8-4> 115 1 1 2 4^544 6 -5 1477 9 ■£. 



40 j £60l4»O j 7 0EJ1Q-4-0-OI65S10 j £00j 80 503 13 5J £-60 



14-2J 



1£6 



100 



133 



So 



4-6 i 176 63 



5-0 ! 171! 4-4 



a-85 



4-3 



113 j 69 

 115 ,66 

 1S3 47 



167 



6-a 



53 ! 130 73 



138j 8 £ 



0»36|«-6frM0l 3 3 33O0!4-9 l£10l£-7O 



143 1 4-1 



OiKljIl-l S63O4-0,107l3Oi-85rT88|5 2. 



£44 70 



14; 



0364K2-6 7010 63 



&5 



186:5-1 



£11 1 180 



ies 



6-5 8270| -8815500 5 S\-Z 03 fr + 



9-7 5£30 l0-0!t170C| 3-8 



4--4- 



3 24 012.463 130 



35 10383:13-3 5400 1 Q -310TOo| 7 



238 110 



loon 



18711 



871551 



4-Q | £04-, 77 175 j 39 ,04851 58 |58H'l gO J1063JJ T T \ 1 341 7 i 



Type 1. gives valuts of E^^Zy , Elashc Limit- and Modulus of Rupiure in dsrcchonXOX 



___a E*^, *ox 



-.3 



.4- 



_5 



.6 



_ L. 



F 



y< 





^1 



YOY 



YOY 



-2021 



For description of type of experiment see page 874. 



The above procedure was adopted because appreciable 

 differences in the values of the properties were often evidenced 

 for pieces which had been nearly adjacent to each other 

 in a balk. Reasons for this seemed to be accounted for by 

 variations in the structure of the test pieces which were often 

 visible when they were examined under the microscope, and 

 it was considered sufficient to treat the variations as charac- 

 teristic of the structural nature of the material, and to take 

 the means of the properties as representative of the balk. 



It will be noted from the tables that the humidity or 

 moisture contents of all the pieces are sensibly the same, that 

 is about 12 per cent. 



* ' Theory of Errors and Least Squares.' Weld, New York, 1916. 



