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

[Royal Pemberton]

Curious about Victor saying publicly they're OK with other companies using
the eccentric stop groove in November 1934....I wonder if Columbia ran into
trouble with them earlier in the year?  As the few May 1934 Columbia sides
I have end with eccentrics and the August 1934 Columbia I have, 2942-D,
which has (AFAIK) the lowest numbers in the CO-prefixed ARC numerical
series (CO.15541 and 15542) has instead the older concentric stop groove.

On Mon, Mar 4, 2013 at 3:06 PM, Milan Milovanovic <
milanpmilovanovic4 at gmail.com> wrote:

>
> Consider including raised blank outside area on some early pressings. Think
> they used it to block needle slippage from the beginning of record. The
> same
> method used for inside area with no locked and lead-out groove - raised
> portion of the record used as for later transferred into locked groove.
>
>
> ----- Original Message -----
> From: "David London" <jusmee123 at gmail.com>
> To: "78-L Mail List" <78-l at klickitat.78online.com>
> Sent: Monday, March 04, 2013 12:28 AM
> Subject: Re: [78-L] Approximating 78s age by physical characteristics
>
>
> > 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?).
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>
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