From: jpc@tauon.ph.unimelb.edu.au (John Costella)
Subject: Re: PHIL: Meaning of "graphics" (Was Re: SCI: sound cues
Date: Sat, 8 May 93 18:40:08 EET


> >The term holography has visual connontations, regardless of its
> >written definitions.
> >Brian Karr
> 
> Yes and no. "Holograph" was originally coined by people either in
> publiching or in English Lit. to refer to a book that is in complete
> manuscript form, including cross-outs, edits, etc.
> Something like that.
> 
> The term dates from the 40's or 50's.

Well, almost. :-) In 1623 Cockeram defined it: ``Holograph, a Testament
all written by the Testators hands".

Unfortunately that's not the meaning we're after. That derives from
`hologram', invented ...

1949 D. Gabor in Proc. Roy. Soc. A _197_, 456. ``The name `hologram'
is not unjustified, as the photograph contains the total information
required for reconstructing the object, which can be two-dimensional
or three-dimensional.''

and thus onto the word `holography':

1964 Phys. Lett. _13_, 308. ``A well-resolved, magnified `image' of
the scattering object has been reproduced .. without losing the general
simplicity and speed which are characteristic of holography.''

To be fair, `ultrasound holograms' appeared about 20 years after
light holograms. The distinction to be made is between a hologram
and simple 3-d sound. Unless you form a graphical, viewable IMAGE of 
the object, you can't use the `-graph'. 
 
John

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John P. Costella              School of Physics, The University of Melbourne
jpc@tauon.ph.unimelb.edu.au          Tel: +61 3543-7795;  Fax: +61 3347-4783
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