[78-L] Approximating 78s age by physical characteristics

[David London]

On 03/03/13 23:10, Mark Bardenwerper wrote:
> I can't add much to this, but it should be noted that many of the 
> groove additions came with the invention of automatic changers. The 
> change in labels had to do with the manufacturing process. The 
> beginning of the electrical era had something to do with some of these 
> changes. Before electrical recording, there were electrically driven 
> platters. Someone more in the know might tell us if there was a 
> workable changer in the acoustic era. It would have been a challenge 
> due to the heftiness of the arm, but people could be pretty imaginative. 

I was wondering also, if changers existed before lead-in grooves. It 
seems a key addition to a record, else you risk the needle just sitting 
floating on the leading edge of the record (or did they bias the arm to 
always swing inward when there was no groove?).