ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



97 



the whole apparatus, ready for use, can be carried in one hand. The 

 measurements of the case are 18 by 7 by 7 in., and the weight 15 lb. 



Fig. 5. 



Nernst-Paul High-power Electric Projector Lamp.* — This pro- 

 jector lamp (fig. 6), which is a high-power illuminant for the lantern, 

 takes a current of about three amperes, and in the same lamp a burner 



Fig. 6. 



may be used suited either for direct or alternating current, or for pres- 

 sures of 100, 200, or 250 volts, a different burner being required for 

 each of the systems of supply. 



Nernst-Paul Electric Science Lantern.|— This lantern (fig. 7) is 

 adapted for horizontal or vertical projection, the whole apparatus being 

 mounted on trunnions. When used for vertical projection the lantern 

 is turned into the upright position, so that one reflector only is needed 

 and brilliant illumination insured. The change from one position to 

 the other is effected instantaneously. The metal stand has levelling 



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

 Feb. 21st, 1906 



t Op. cit. 



