This came up on a social networking site. Firstly as a question, do you remember the real name for the gadget for copying drawings/diagrams and scaling up or down. This was an invaluable tool to me in my school days when drawing maps. A precursor to CAD and the photocopier! This “toy” however dates back to 1603 and an invention called the Pantograph!
After a bit of research I found this site on how to build one.
This led me onto thinking that there may be a number of gadgets like this, derived from original designs that are centuries old. With my recent posts on manufacturing and turning this on its head. I am working up an STL file of one of these which I will test and then upload to enable anyone to have one of these great inventions to use. ff they can print it out for themselves on a 3D printer or just provide the cad plans to print out on a normal printer/plotter and cut out on your own medium.
Thanks to Robert Grant for the inspiration for this entry.