SINGLE SIDEBAND TRANSMISSION 73 



transmission over the same transducer, the carrier being located at the 

 center of the characteristic, the dark current being practically zero. 

 It will be observed that the single sideband transmission gives ma- 

 terially more detail than the double sideband transmission, thus indi- 

 cating that the presence of the quadrature component is not nearly so 

 serious as a halving of the frequency range. It might perhaps be 

 thought that this unfavorable showing of the double sideband trans- 

 mission is due to the presence of some special distortion which might 

 be expected in a filter designed for single sideband transmission when 

 used in a manner not intended. On examining the characteristics no 

 such distortion is found. 



Acknowledgment 



We have had the helpful cooperation of Dr. P. Mertz in this in- 

 vestigation. 



