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[malcolm_davidson <malcolm_davidson@xxxxxxxxxxxxxxxxxx>]

On Fri, 28 Mar 2008 21:36:59 -0500, Steven C. Barr(x) wrote
> ----- Original Message ----- 
> From: "Tom Fine" <tflists@xxxxxxxxxxxxxxxxxxx>
> > Were retail-sales disks always pressed from manufacturing parts of some 
sort
> or was that a Berliner
> > or later innovation? Didn't cylinders have to be made in batches, 
mechanically
> copied from a
> > "master" and weren't the batches relatively small? Or was that just 
Concert
> cylinders?
> >
> Berliner used master recordings made by cutting grooves in wax-
> coated zinc discs which were then dipped in acid...allowing the acid 
> to "eat" the exposed zinc metal and thus create a negative copy of 
> the recording. In some cases, these "zinc records" were sold as 
> such...in others, they were used as moulds (stampers) to create mass-
> produced (comparatively, anyway...?!) duplicates. Later on, the 
> process of using wax master discs for recording was introduced (thus 
> the "Berliner Improved Gram-O-Phone Record"...!), which reduced 
> background noise.
> 
> Until Edison introduced "Gold Molded" cylinders (c.1904, right?), the
> only way to manufacture quantities of cylinders necessitated the use
> of mechanical pantographs as well as multiple recording machines...
> 
> Steven C. Barr


Malcolm