I am out of coffee. For two days now, trying to kickstart my brain with green tea. It's not working.
 
I could walk to the corner 7-11, but I get up at an hour when you can get harassed by cops for merely walking down the street. Plus it's pitch-dark and frickin' cold out. OK, laziness is a factor as well.
 
One symptom of caffeine deficiency is when you search for a word and are unable to conjure it. So I am reaching out to those who've been adequately caffeinated today, or at least have been up for a few more hours than me.
 
I am trying to remember the name of the device that lets you trace a pattern while it redraws the same pattern larger or smaller. It's called a something-graph. I know it ends in "graph". Any graphic artists in the crowd who remember what this device is called?

I think the word you are looking for is "Pentagraph"
 
Here is a youtube video
https://www.youtube.com/watch?v=clKDEIxINVA
 

It's was called Sketch-a-Graph in the UK Dave, I actually found one in a drawer a couple of weeks ago.
 
When I had a sign making company we had a machine called a Pantograph which had an engraving tool on the end, similar principle.

Pantograph! That's it! Muchas gracias, amigos.

Or was it 'Spirograph'?
 

Etch a sketch?

Yeah Spirograph is what immediately came to mind for me. I can still remember playing with mine as a kid in great detail. That clicky motion as you rotated the discs....
 
Incidentally, green tea doesn't do it for me either caffeine-wise. But Matcha tea does. Way more caffeine in it and while it doesn't have quite the same kick as coffee, it's more sustained. 

Both the Spirograph and the Etcha-Sketch were childhood favorites. But "Pantograph" is the word that I was trying to pull out of my head, to use as an analogy for a cool dynamics product I'm writing up. 
 
I've now moved on to other pressing matters. Such as whether I should get a haircut before leaving town. I'm overdue for my annual shearing. $20 for a cheap haircut, but I expect to make that up in shampoo savings.

I think you need to pick up a can of coffee. :-)

bitflipper
One symptom of caffeine deficiency is when you search for a word and are unable to conjure it. 

It appears that I need to consume a LOT more caffeine then! 
 
(I remember when a phonograph would make something seem bigger than it was too!)