The Talking Machine Forum — For All Antique Phonographs & Recordings

Since no one has seemed to cover the info for Graphophone brass horns, here is my two cents:

The photos show an Edison 15" horn on the left and a Graphophone 15" horn in the right. Notice the narrower cone section of the Graphophone horn.

Both of those horns are from the late 1890's. Notice the flat seam around the bell. The later ones would have a crimped seam around the bell. These horns were to heavy for the earlier Columbia machines like the Model A, AT, etc. These were used on the Early Edison machines like the Suitcase Standard, Home, Spring motor, etc.
Harvey Kravitz