Geraco Radio Accessories -1922A.jpg Frost Fones -1922BThumbnailsHaller-Cunningham Rotary Spark Gap -1913AFrost Fones -1922BThumbnailsHaller-Cunningham Rotary Spark Gap -1913AFrost Fones -1922BThumbnailsHaller-Cunningham Rotary Spark Gap -1913AFrost Fones -1922BThumbnailsHaller-Cunningham Rotary Spark Gap -1913AFrost Fones -1922BThumbnailsHaller-Cunningham Rotary Spark Gap -1913A

Ad for loud speakers (radio amplifier), variometers, dials, and the variocoupler, from the General Radio Corporation of Philadelphia. Here's a picture of one that survives to this day. Published in the October, 1922 issue of RADIO NEWS.



Source: Magazine collector Steve Davis

Restoration by: magscanner