What is this?
Posted: Wed Feb 25, 2009 9:59 am
My guess is that it enabled you to attach the earphones of an early radio set to your phonograph tone arm and use the horn to amplify the sound. A lot of similar devides were sold, most contained a small speaker driver which fitted on in place of the soundbox.
At the top of this link is a small horn tha was intended to be fitted with an earphone driver. http://www.radiolaguy.com/Speakers-1920s.htm#AK-M