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

[Milan Milovanovic]

Probably not all the lamination were the same. Once I saw some Italian 
Columbia pressing - somebody tried to break the record into pieces and ain't 
broke into small chunks but into two large pieces with exposed 
cardboard-alike core.

Another thing I saw while examined broken edge on some American Odeon 
(orange label) record: black (shellac) core wrapped in some kind of paper 
then top of that thin layer of (fine) shellac.

M.

----- Original Message ----- 
From: "Michael Shoshani" <michael.shoshani at gmail.com>
To: "78-L Mail List" <78-l at klickitat.78online.com>
Sent: Monday, March 04, 2013 12:20 PM
Subject: Re: [78-L] Approximating 78s age by physical characteristics


> On 03/04/2013 02:27 AM, Michael Biel wrote:
>> Trying to catch up on two points.  I capitalized New Process because
>> this was a new advertised feature for Columbia in 1923, and coincided
>> with the flag label.  You will see this advertised on the sleeves. BUT
>> as someone said, the blue and gold Columbias were also laminated.  There
>> might have been some kind of change at the factory at that point, or
>> maybe this denoted the use of a higher quality surface shellac.
>
> When I get a chance, I'll go through my archive of sent mail. I rather
> excitedly sent to Dr. Biel some links to Google Patents; in exploring
> the concept of lamination, I found that Columbia (and American
> Graphophone) had actually begun patent applications as early as, if I
> recall correctly, 1903. But it seems to have taken several years of
> experimentation before they got it down to their satisfaction.
>
> The kicker in these was the process itself; rather than Victor's method
> of a solid biscuit that was then heated and kneaded around into a
> puttylike mass, the constituents of the Columbia laminated process never
> went through a heat-and-knead process. The solid core was made of clay
> and other heavy materials; to it was affixed a paper disc that had been
> laminated with the fine shellac mixture for the surface. The two layers
> (three when double-sided pressings became the norm) were fused together
> under heat and pressure in the hydraulic press that also imprinted the
> record groove and label.
>
> Michael Shoshani
> Chicago
> _______________________________________________
> 78-L mailing list
> 78-L at klickitat.78online.com
> http://klickitat.78online.com/mailman/listinfo/78-l
>