3i6 hull: transmitter of modulated waves 



This can be accounted for only as a mixture of sulfide and 

 phosphide, and oxidation products intermingled with carbon. 



Small plates including lath shaped pieces, extremely brittle 

 and strongly magnetic, of a brownish color were detached in the 

 process of cutting. These yielded the analysis given in table 3. 



TABLE 3 

 Composition of Brittle Portion 



Fe 73 22 



Ni 6.35 



Co ^ 0.25 



Cu 0.02 



P 5 02 



S None 



C 2.51 



CI Not determined 



SiO-. 0.28 



Ca 0.20 



Mg o .07 



Cr None 



Oxygen 12 .08 



100.00 



The analysis in table 3 shows that the material is largely 

 schreibersite and magnetite coated with little carbon. 



On crystallographic grounds the iron will be classed as a 

 broad, or coarse, octahedrite. The taenite plates are very thin 

 and in the 3320-gram piece retained in Washington, there seems 

 a tendency for both the taenite and schreibersite granules to 

 gather in the outer portion of the iron, leaving the interior nearly 

 free. 



RADIOTELEGRAPHY.— Aw electron-tube transmitter of com- 

 pletely modulated waves. '^ Lewis M. Hull, Bureau of 

 Standards. • 



In order to utilize a radio-frequency oscillation of given power 

 most effectively in a non-oscillating receiving system, it must be 

 completely modulated, the periodic reduction of the current 



^ Received April 12, 1920. Published by permission of the Director of the "Bureau 

 of Standards. 



