Early hearing aid...

Item # 631532

January 30, 1886

SCIENTIFIC AMERICAN, New York, January 30, 1886 The front page of the issue has "The New York Cable Railway" with an accompanying illustrations. Inside the issue is: "The Micro-Audiphone" which was an early hearing aid; "Combined Milling and Slotting Machine"; and more articles, illustrations and advertisements.
Complete in sixteen pages, unbound, in nice condition.