Visit a better office supply place (mom and pop, not the big box stores.
Maybe look for one that specializes in artists and architects) and ask for a
pantograph. You can get or make them for just about any trade. The
previously mentioned rivet spacer uses the same folding idea but keeps
proportions the same, whereas the pantograph changes the proportions as you
need.
The other thing I think is called a marking gauge, and you can see the
different ones he http://www.brendlers.net/oldtools/gages/sgp/basics.htm

"Ron Culver" wrote in message
...
| Newby here .. there is a device for measuring equal increments for marking
| .The object looks like a small metal folding gate such as would be used to
| keep kids in a room or out of one.One decides on a marking increment such
as
| 10 mm or such and then adjusts the device until all of the marking holes
are
| at 10 mm. I don't know what it is called or where to get one... also there
| is a plastic hich holds an ink marker and can be adjusted to draw a line
at
| whatever incremenet one chooses ..it looks like a small block of plastic
| with a hole for the pen and an adjustable leg.. same question what are
they
| called and where in the US can I buy them?
|
| Tx,
|
| Ron Culver
|
|