[78-L] the 'deadest' consumer audio formats?

[Kristjan Saag]

Actually, the category "78's" hides formats so different that they 
should qualify as separate formats.
As we all know all 78's weren't 78 rpm or shellac or lateral cut or 
10''. Berliner's first discs (made in Germany around 1890), for 
instance, were 5'', made of vulcanite (hard rubber) or celluloid or even 
zink. Speed was also significantly higher than 78 rpm. Add to that the 
3'' doll records.
Etc.
Kristjan