496 



Dr. J. F. Main. 



Eemarks. 



Here it was no longer 

 possible to screw 

 down Gr. 



Minimum 

 temperature 

 out of doors 



preceding 

 night. 



. 



■ oaoMoow w o 

 csi i>. 10 co ^ ^ • . oo 



NHHH HH rH . . iH 

 1 | 1 1 1 1 1 1 1 



Maximum 

 stress in 

 kilos, per 



square 

 centimetre. 



• • ... CO 00 05.,(M 



Mean stress 

 in kilos, per 



square 

 centimetre. 



CO 



<N 



Mean hourly 

 extension in 

 hundredths 



of a 

 millimetre. 



COOOCOKSO-^OOOOOOOup 

 (NfMCO^fCO-^WS^COOt^t^COlOCO 



Mean 

 extension in 

 millimetres. 



M»iMHOoosqo^ai>oi>H(M 



rr\ \r\ —J »rs (~*\ rvi r\l i , i j-sri t^, (~\ _j r*\ 

 K±J 1-1 «J J.^ 1W UN F~1 T*"1 *W r™~l \*J 



OOOrHiHrHiHOOOOOOOO 



Mean 

 distance of 



rings in 

 millimetres. 



<MU3iH-<?U3«5CO»»W5O5 00«5WSCQCOW5 

 rHl>COOTHCOJ>05i-l(N^l>'!ftlOCDTfl 



WlOC0i>0005OHNN(NN«)05W'* 

 COCOCOCOCOCO-^rpTf(TflTJf(Tjl^^Tj(^ 



Temperature 

 in degrees 

 centigrade. 



coco^coeqcq-^io-^coco-tf* 



1 1 1 1 1 1 1 1 1 1 1 1 



Hour. 



C\|C<IN(NC\|rH(?qiH'<?C000C\|00O(Nr-l 

 rHiHpHrHiHi-lr-ti-liHiHrH(N H H H 



Date. 



£> MOlOHNm^iO CO J> 

 M rH r-i iH r-H rH rH iH 



00 

 H 



