The thesis has even finer horizontal spacing, creating a perfect centering effect of variable width line numbers, while the rest text on the same line is grid aligned. It's not something you do with a typewriter, unless you are a computer science PhD.
For the selectric typewriter, the horizontal spacing can be manipulated by swapping between different typewriter golf balls.
Pre-computer age summer high school project utilized different selectric golf ball fonts & spacing to make use of the golf font characteristics to create text pictures/art (font kerning & spacing). The high schoolers that participated in the project were not university admits yet.
The ultimate thesis hack, automated web page search & comparison to find selectric golf balls that match the thesis paper font/type/kerning.
