original CD is an optical disk. This technology evolved to the CD we use today.
The glass platter shown in the picture was constructed by Stanford Research
Institute (now SRI International) under contract from a private investor. This platter
is very special. It had to be optically flat to work in the application. The
platter has Tellurium (Te - element 51) deposition on the glass platter.
Tellurium is an easily ablative material. Because of the nature of the material
a small highly focused laser could burn a micron size hole in to the material
in effect writing a data bit. You can see the holes with a microscope. Tellurium in some form is used in CD’s today.
I am not
sure what the date that this disk was made. My guess is the early 70’s. When I
received it I was told there were 5 made at a cost of $500,000. SRI had to
build a special vacuum chamber to make the deposition of Tellurium. The glass
platter had to be optically flat. Making this platter was an expensive
process. SRI filed the original patents
on this technology.
In 1975 I
worked for Digicon Inc. an oil and gas service company. Digicon had several
exploration deep water vessels (boats) use to do offshore seismic surveys. The
data was collected on magnet tape. The logistics of moving tape from the boat
to shore and back was always a problem.
I conducted a technology study to see if there was a more efficient
storage technology. During this study I contacted SRI and subsequently met with
SRI business development staff at SRI. In one of these meetings I ask for and
received this platter so I could show the people at Digicon. You could call it
a production sample. The platter is 14”
Later I had
the platter mounted as shown. I have no documentation that shows the
provenance. I am sure that the SRI
connection could be verified by SRI. The deposition material could be verified
by any material analysis lab.
historical technology has high value and represents a technological milestone.
Disclaimer: The pictures of the item for sale
are actual pictures of the item. If you have not completed at least 5
transactions on email me prior to offerding. I carefully pack and ship every
item. If the item is damaged it will be your responsibility to assist me in
processing any insurance claim. You must return damaged goods to me. I will
arrange shipping pick up. In the event of damage you will be reimbursed the
sale amount and shipping only and only after the claim has been paid. I do
my best to ship as soon as funds clear the bank, in some cases I may be
traveling and will take a few days to get the shipment processed. I expect you
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to sell the item again. I accept PayPal from certified address only and only
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to sell the item again. All sales are final unless specifically stated
otherwise. The sale comments reflect the condition of the item as close as