Ah, very interesting about the Diamond Discs... Having just recently handled
one myself I thought they were just a very thick shellac. Good to know about
the wooden core! I'm assuming these discs are then subject to the same types
of preservation concerns as other laminates - swelling/contraction of the
core, laminate peeling, etc.?
On Thu, Nov 19, 2009 at 12:52 PM, [log in to unmask] <[log in to unmask]>wrote:
> Interesting observation about the "sound" a record makes when being
> Not all instantaneous records are heavy. If they are paper substrate, they
> will be much lighter. Glass and alum., heavier.
> Getting into some esoterica here...Columbia 78s from a certain period are
> laminated, perhaps not quite so heavy as a solid shellac. I have nevered
> weighed either. Edison Diamond Discs are laminate over wood core and VERY
> heavy (and thick), These are all commercially released records, not
> joe salerno
> Shai Drori wrote:
>> I never thought of this. It's sort of automatic to me and I guess to
>> everyone else. The look and feel totally different, that I never spent a
>> second thinking about it. Vinyl is light flexible has a certain shine to it
>> and almost no sound when you handle it. Shellac has this sound to it when
>> you handle it that sounds brittle, sort of like a "don't @#$^ with me". And
>> instantaneous are very heavy compared to the others of the same size. Of
>> course there are exceptions to the rule but over time you sort of just know.
>> The last time I was puzzled by a record that felt "wrong" was a few years
>> back when I got a shipment of glass records. During the War aluminum was
>> gone to the army and different substances were used for the base, glass
>> among them. Never been more scared than handling those records and that
>> includes nitrate stuff. The up side was that they were ruler flat and played
>> on the emt like a dream, great sound.
>> Tracy Popp wrote:
>>> Hello All,
>>> I have a question on visual identification of, and differentiation among
>>> shellac, instantaneous and vinyl grooved disks. Are there quick visual
>>> non-destructive methods of determining the type of disk?
>>> I am aware that most instantaneous have three "spindle" holes in the
>>> and one can generally determine that a disk is an instantaneous based on
>>> core material (if one can see the core material.) Any other suggested
>>> methods of quick ID and differentiation - barring cracking the edge of
>>> disk to see the material composition? Is gently tapping the disk surface,
>>> and listening for aural cues about material density an useful practice?
>>> Thanks for your assistance!
>>> Tracy Popp
>>> UIUC Graduate Student MLS