i\IancJicster Memoirs, Vol. Iv. (191 1), No. \%. i 



comparison with i^/;''. 4' the older specimen showing 

 cooHng over a greater range of stretching weights than 

 the new specimen. 



Expansion on Heating. 



For the purpose of accurately measuring the expansion 

 of rubber under conditions of varying temperature, the 



i^^^^^^T^^ 



I-ig. 6. AiUhnr.s' Expansion Apparatus. 



apparatus shown in Fig. 6 was designed. A copper tube 

 'A,' 14" long and i " in diameter, was surrounded by an oil 

 bath ' B ' heated electrically by means of a coil of bare 

 wire ' C ' wound upon a wooden frame. Over the upper 

 end of the tube 'A' was fixed a tightl3/--fitting cap 'D' 

 well lagged with asbestos. From the centre of this cap a 



