ned@scirtp.UUCP (Ned Robie) (11/19/85)
The cover of the latest National Geographic is a 3D picture of a skull, and when it's held in the light at the proper angle the 3D effect is startling. I know that such pictures are made with lasers, but what is the process? Also, how are these pictures mass reproduced? The picture on the magazine looks like silver paper with some black substance on it. Or is the "black substance" really an etching of some kind? Answers would be appreciated. -- Ned Robie
drv@kitc.UUCP (Dennis Vogel) (11/20/85)
> The cover of the latest National Geographic is a 3D picture of > a skull, and when it's held in the light at the proper angle > the 3D effect is startling. I know that such pictures are made > with lasers, but what is the process? The picture is a holograph. I saw the issue in a doctor's office recently. I read a short blurb inside the issue (can't remember exactly where) about the person responsible for producing the holograph and how it was done. Look inside the front cover or on the contents page for a paragraph that descirbes the cover. I believe it references the blurb that is elsewhere in the issue. And you're right. The effect is startling. Dennis R. Vogel AT&T Information Systems S. Plainfield, NJ
daw1@mhuxl.UUCP (WILLIAMS) (11/21/85)
> The cover of the latest National Geographic is a 3D picture of > a skull, and when it's held in the light at the proper angle > the 3D effect is startling. I know that such pictures are made > with lasers, but what is the process? Also, how are these > pictures mass reproduced? The picture on the magazine looks like > silver paper with some black substance on it. Or is the "black > substance" really an etching of some kind? Laser hologram is the name of the process. About a year or so ago they had an eagle or something on the cover that used this technique and an article inside explaining the process. Check it out. Also, try Disney World in Florida's Haunted Castle for *moving* holograms: ghosts float around and as the ride is about to exit there is a mirror on the wall so you can see the ghost sitting on your shoulder! Wow, it's neat stuff. 1 1 1 1 2 1 Doug Williams 1 3 3 1 AT&T Bell Labs 1 4 6 4 1 Reading, PA 1 5 10 10 5 1 mhuxl!daw1 1 6 15 20 15 6 1
daw1@mhuxl.UUCP (WILLIAMS) (11/21/85)
I forgot to say that Visas and Nastercards now have
holograms on them for counterfeit-proofing purposes. Of course
when they first came out the clerks would have fun showing
everyone the "spaced-out charge card this dude has."
1
1 1
1 2 1 Doug Williams
1 3 3 1 AT&T Bell Labs
1 4 6 4 1 Reading, PA
1 5 10 10 5 1 mhuxl!daw1
1 6 15 20 15 6 1steiner@topaz.RUTGERS.EDU (Dave Steiner) (11/22/85)
For a complete description of how the holograph was made, see the
article that was in the issue with the eagle holograph on it (sometime
around the first of the year, but I don't remember the exact month).
It explained the process in full detail.
ds
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uucp: ...{harvard, seismo, ut-sally, sri-iu, ihnp4!packard}!topaz!steiner
arpa: Steiner@RUTGERS or Steiner@RED.RUTGERS.EDUbrown@nicmad.UUCP (11/22/85)
In article <547@scirtp.UUCP> ned@scirtp.UUCP (Ned Robie) writes:
[author asks how recent 3D National Geopgraphic cover (skull) was created]
Suggested reading: National Geographic, March 1984, page 372
In it a complete discussion of how their first cover, an eagle, was done.
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Mr. Video seismo!uwvax!nicmad!brown
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decvax------/langer@lasspvax.UUCP (Stephen Langer) (11/27/85)
In article <435@nicmad.UUCP> brown@nicmad.UUCP (Mr. Video) writes: >In article <547@scirtp.UUCP> ned@scirtp.UUCP (Ned Robie) writes: > >[author asks how recent 3D National Geopgraphic cover (skull) was created] > >Suggested reading: National Geographic, March 1984, page 372 > >In it a complete discussion of how their first cover, an eagle, was done. >-- As I recall, the article in the March 84 issue contained an awful lot of what is known in the trade as "hand waving". The trouble with "scientific" explanations in popular journals is that in order to reach a wide audience, the author has to leave out everything he doesn't think everyone will understand. (Sometimes, what's worse, is that the author includes stuff that he/she doesn't understand. This is not necessarily the author's fault, I know.) Anyhow, does anyone out there really know how the flat reflection holograms work? I would like to know too. -- 0)) ((0 0 __ <|..|> :0_ _0: \/ / \ \ / ---||- || Steve Langer /\ Physics Department, Clark Hall / \ Cornell University _\ \_ Ithaca, NY 14853 {ihnp4,decvax,allegra,vax135}!cornell!lasspvax!langer