SCIENTIFIC AMERICAN, New York, June 12, 1880 

* Thomas Alva Edison
* Phonograph invention

An inside page has a brief yet noteworthy report under: "Patent Office Items" reading: "Mr. Edison has just obtained a new patent for improvements on his original phonograph, by which the machine is made to speak to better advantage than ever before." (see)
The balance of the issue has a wealth of other articles with prints concerning the latest inventions & improvements of the day.
Sixteen pages, very nice, clean condition.