96 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



which serves as a handle for carrying. There are the usual coarse and 

 fine adjustments, and the accustomed substage fittings. 



Fig. 4. 



f(3) Illuminating- and other Apparatus. 



Nemst-Paul Optical Electric Lantern.* — This compact and portable 

 lantern (fig. 5) is constructed entirely of metal, and may be connected to 

 any electricity supply system. It does not require any special prepara- 

 tion or external appliances. It is specially adapted for travelling, as 



* R. W. Paul's Special Catalogue, 1905. 



