Talk:Photocopying
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what's the name for the copying method that makes copies with purple ink that smell of meths? UK school in the 80s used it before they got photocopiers. -- Tarquin 11:45 May 12, 2003 (UTC)
There were several, among them the Gestetner machine and the Ford-a-graph (sp?) machine, better known as the "forgeagraph". Ink was either purple or green, and smelled great! Haven't had a nice glass of meths in ages. Guess they don't make it like they used to. Tannin
Lol... that's it, the Gestetner. The name was devised to reduce schoolchildren to tears when sent to the office to ask for a pile of papers: "miss Foobar asked for the gestet... gestet.... er.... *wail*". Anyway. we should mention these prior technologies on this article :-) -- Tarquin 12:01 May 12, 2003 (UTC)
- In our U.S. school we just called it a mimeograph or even shorter the "ditto" machine. Rmhermen 13:40 May 12, 2003 (UTC)
No, the Gestetner used printer's ink - the master was typed onto a waxed membrane. The purple ink was used in Banda machines. --grahamp
Wow... nice growth, y'all! We should add stuff on the meths etc to Duplicating machines. -- Tarquin 16:00 May 12, 2003 (UTC)
"[T]he area of xerox art developed in the 1970s and 1980s" -- is there any cite on this? I think it was earlier. --Daniel C. Boyer 18:03, 10 Oct 2003 (UTC)
- Some photocopying machines contain special software that will prevent the copying of currency.
Details please, someone? Or is this just a rumor to try and deter this? What is the principle of this software?
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[edit] Gestetner
Gestetner is a company name. The company is now owned by Ricoh.
No rumor here- many copiers use pattern matching to recognize currency- not only will they not produce a copy of it, they will usually enter an error state and no longer copy anything until the code is cleared. Clearing the code requires contacting the manufacturer of the device- who are then obligated to contact the feds…
Why can't you photocopy a mirror? I know that I have always been told that it could short out all the power in the building, but why does the copier do that? Been searching the web (ask.com, yahoo.com) but can't find any reason why you shouldn't
- I wouldn't, if I were you. You might create a singularity which destroys the entire universe. (Or a sheet of wastepaper.) jdb ❋ (talk) 23:35, 7 Apr 2005 (UTC)
______________________________________________________________________________
I have worked for Gestetner, and also for other copier companies. The Gestetner did indeed use ink, squeezed through the stencil, to produce the image. The Ditto machines, and others that produced the purple, blue, green, or red print using alcohol type solvents were generically known as "spirit" duplicators.
As for the photocopying of a mirror, I have the answer... Photocopiers use mirrors to reflect the image from the original to the lens. Any normal original will reflect some light in all directions, including into the next mirror. A mirror placed where the original should be would reflect light only in one direction, at the wrong angle to hit the next mirror. In the drawing below, the circle is the light bulb, the ++ indicates where the light should go, and the ** indicates where it will go if a mirror copied. Since it misses the next mirror entirely, no light will get to the lens, resulting in a black copy.
________________ Paper++ (or mirror**)
/|\
/ | \
/ | \
** | O Bulb
|
m\ |
i\|
r\--------- ++ To lens
r\
o\
r\
Sasquatch71089 05:05, 22 November 2005 (UTC)
[edit] Ass Photocopying
There really needs to be at least a few sentences devoted to this cultural phenomenon. Kade 23:27, 30 November 2005 (UTC)
[edit] fist color copier 1973???
In this article it is said: "The first electrostatic color copier was released by Canon in 1973." This seems in error. The Canon site: http://www.canon.com/about/history/main08.html mentions under 1983: "The NP Color T, the company's first color copying machine, is introduced." "1973" is a typo, correct?
This: "In 1937 Bulgarian physicist Georgi Nadjakov discovered the photoelectric effect." needs to be changed. Einstein received a Nobel prize for work he did on the photoelectric effect in 1905. Hard to do if it hadn't been discovered for 31 years.
—The preceding unsigned comment was added by 151.204.41.129 (talk • contribs) 21:33, July 12, 2006.
I've removed the discovery (photoelectric effect states it was observed in 1839), and added a cite needed to alert someone to check the rest of the paragraph.
As an aside, weren't there processes that duplicated prints prior to the Xerox? Should this article discuss more of the history of copying by use of photons? They were not as fast or as convenient as the Xerox, but they were used.-213.219.151.76 11:13, 23 July 2006 (UTC)
[edit] Carlson
It says Carlson was required to copy a lot of papers, but it doesn't say what method he had been using. The Storm Surfer 20:33, 9 October 2006 (UTC)
[edit] External Links
The link to color copier is to a Xerox sales site, with small, poor pix of machines. This link is a good candidate for deletion. LorenzoB 17:14, 28 November 2006 (UTC)
