RE: old school

[Fred Ridder <docudoc -at- hotmail -dot- com>]

> Mimeograph? That has a drum and makes "dittos" of things, at least that's
> what I heard the copies called. But I don't know about the hole punching
> thing.
 
Mimeograph and ditto were two different technologies. 
 
With ditto every character you typed when making the master deposted 
some pigment from one sheet of the 2-part stencil form onto another sheet. 
Then you put the stencil on a drum that contained a volatile (and probably 
toxic) solvent that dissolved part of the deposited pigment and allowed it 
to be deposited on a specially coated copy stock. The drawbacks of ditto 
systems (aka "spirit duplicators") were that you could only make about 
30-40 clear copies before the pigment deposited on the stencil would be 
depleted and the copies would become illegible, and the duplicated copies 
were purple. The advantage was that the copies smelled great if the 
teacher had just run them off a few minutes before class. 
 
I don't know exactly what the mimeograph technology was, but it was
good for more like a few hundred legible copies from each master, and 
the images were reproduced in black and did not have that wonderful
solvent smell. Not nearly so interesting to elementary school students...
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