498 



Dr. J. F. Main. 



n 



<D 

 Oh 



H 



w 



s 

 I 



Specimen without 



load. 

 Load of 55 kilos. 

 Load of 12*5 kilos. 



Range of 

 temperature. 



C CCNNO 

 CO ^ CO <N 4? 

 1 1 1 1 1 

 • • O O O o o 



HHHCO 



' 1 1 1 1 



Maximum 

 stress in 

 kilos, per 



square 

 centimetre. 



o-oo 



0-85 

 1 -9 



1 -98 

 2-08 



Mean stress 

 in kilos, per 



square 

 centimetre. 



o-oo 



0- 85 

 19 



1- 95 

 2 



Mean hourly 

 extension in 

 hundredths 



of a 

 millimetre. 



O C5 OD N O O 

 QCHHNHH 



Mean 

 extension in 

 millimetres. 



(N io 01 o © ^? 00 

 <M O <N CO <M r-l © 



O OOOCOOO 

 1 



Mean 

 distance in 

 millimetres. 



Ci -H0005C50505H 

 CD OJONiOCiHW^ 



•us \a io cc cc co j> j> J> 



r-l i—lr- IrHi— Ir-lrHrHr-l 



Temperature 

 in degrees 

 centigrade. 



t? 00 i> xu> © cp 



1 1 1 1 1 1 1 



Hour. 



H« r4et 

 rH H O 05 Cll> 

 r-l r— r-l rH rH r-l 



Date. 



1887. 

 Feb. 27th. 



28th. 

 Mar. 1st . 



2nd. 



