DRAFTING ILLUSTRATION

I forgot what this was for exactly but someone needed it for a presentation they were doing. There were 3 drawings showing the phases of drafting through the years. The 1st was a monk using weird old medieval tools, like stretching strings and plum-bobs to get straight lines. The 2nd was this drawing of a guy using a T-square and triangles, and the 3rd was a guy using the computer.