Why 14 inch and 15 inch brass horns?

[whitedogfive]

I finally found an original small brass horn for my Edison standard square top made in 1899. During my search, I found two sizes, 14 inch and 15 inch. The 15 inch were always twice the price (or more) of the 14 inch. The 14 inch horns were also more plentiful. Now I am not talking about the 14 inch reproductions you often see. A friend told me the brass horns of the late 1890's were always 15 inch and the 14 inch brass horns were made a bit later, after the introduction of the black and braas 14 inch horns. The latter 14 inch brass horns were made to the same size of the black and brass horns as that was the size people were used to. Is this true?
I did buy a 15 inch horn. To be honest, I only found 3, 15 inch brass horns in the time I was searching and about 15, 14 inch brass horns.
As always, thanks for your input.

[fran604g]

Great question. I hope the answer is forthcoming.

I'd like to also add one of my own:

Is the internal diameter of small end of the early horns the same as the later ones, for example; the Standard Speaker and Automatic reproducers vs. the Model B, C, etc.?

Fran