86 



Mr. C. J. Lundstrom. 



and more distinct. e z (\ = 5002) is also most probably due to 

 Mn 2 3 , as also the other bands of the e-groups of both the Langshytte 

 spectrum and that of Nykroppa. The band 5226 might also be 

 considered to be derived from the same source. 



Note. — Since the publication of Professor Hartley's two papers on 

 " The Spectrum of Metallic Manganese, of Alloys of Manganese, and 

 of Compounds containing that Element," and on " The Spectroscopic 

 Phenomena and Thermo- Chemistry of the Bessemer Process," ' Phil. 

 Trans.,' vol. 185, A, p. 1029, I have become aware that the bands 

 originally attributed by Watts to manganese oxide, and which I have 

 described as Mn 2 3 , are now for the most part to be ascribed to 

 metallic manganese. — July 4, 1895. — C. J. L. 



The Phosphorus Spectrum. 



Phosphorus is known to yield a spectrum, the most brilliant band 

 of which has the same position as S u and this may serve as an expla- 

 nation of the fact that ^ appears much more distinctly in the Bessemer 

 spectrum than in the Mn 2 3 spectrum. Salet* and Lecoqf have 

 given descriptions and measurements of this spectrum. I observed 

 it in the Physical Laboratory at the University of Upsala. A current 

 of hydrogen was passed over a piece of yellow phosphorus, and 

 through a long glass tube into the air where the hydrogen was burnt. 

 To cool the flame, after the manner of Salet, it was surrounded by a 

 current of cool air. The flame thereby appeared green, and gave in 

 the spectroscope the band spectrum of phosphorus. The bands of the 

 spectrum varied in breadth, so that I obtained an almost continuous 

 spectrum with a large piece of phosphorus, while a smaller piece 

 gave bands that shaded away gradually as the piece of phosphorus 

 wasted away. By using a piece of phosphorus so proportioned that 

 the most important bands were as narrow as possible, so as to be dis- 

 tinctly observed, I made a series of measurements in such a manner 

 that only the maximum of light in each band was recorded. As, 

 however, these bands shade away both towards the least and the 

 most refrangible rays, the numbers quoted cannot be very exact. 



In the following table I give the values of \ obtained by Salet, 

 Lecoq, and myself ; the figures refer to the maximum of light of the 

 strongest bands, and, in addition, I give the bands of the Bessemer 

 spectrum agreeing with them. 



* ' Annales de Chimie et de Physique,' vol. 4, No. 28, p. 57. 

 f 1 Spectres Lumineux,' par Lecoq de Boisbaudran, p. 187. 



