ELECTRON >lICKOSCOPY 



X 



X 



(a) 



(b) 



(c) (d) 



Fig. 14. Electron micrographs and diffraction patterns of Valonia microfibril: (a) and (b) without 

 cooling; (c) and (d) cooled to — 40°C. 



of metallic thin wires as the specimen can 

 be elevated by passing the electric current 

 directly through them (13). In the latter 

 case, only 0.6 to 6 watts is sufficient to raise 

 the temperature of the specimen from 700°C 

 to 3,000°C and some gas, when necessary 

 for the chemical reaction with the specimen. 



can be introduced. Here, only the former in 

 which we have experience, is described. 



Construction and Performance of 

 Specimen-Heating Device. Fig. 15 shows 

 the construction of the transmission type of 

 the new specimen heating device (12) for 

 JEM-5Y electron microscope and Fig. 16 



266 



