Micro-Metallography. By J. E. Stead. 283 



With this reflector working with an ordinary incandescent lamp a 

 photograph of 85 diameters can be taken in 3 minutes when using 

 a No. 3 eye-piece. 



Methods of Illumination. 



The arc electric light takes the premier place ; following it in 

 order are the Nernst light, the acetylene lamp, the incandescent 

 gas burner, the incandescent electric lamp worked at high pressure, 

 and finally the ordinary Microscope oil lamp. 



In conclusion, I must express my indebtedness to Messrs. 

 Carling and Son, Middlesbrough, for the loan of their machines 

 and apparatus ; to Mr. Plumtree, and to the Union Electric Co. for 

 the use of the motor by which the machinery has been worked, and 

 to Mr. Swift for the loan of microscopes and illuminators. 



