As you can see below,
@John Mcrain, Leonardo was one of the first engineers, who wrote in cursive, while keeping leveled lines and mixing letters and diagrams on blank papers.
View attachment 321424
You will need a mirror for that one.
Copied from:
https://www.bl.uk/collection-items/leonardo-da-vinci-notebook
"The manuscript is written in Italian, in Leonardo's characteristic
'mirror writing', left-handed and moving from right to left."
About the original reasons to use cursive:
https://en.wikipedia.org/wiki/Cursive
"The origins of the cursive method are associated with practical advantages of writing speed and infrequent pen-lifting
to accommodate the limitations of the quill. Quills are fragile, easily broken, and will spatter unless used properly. They also run out of ink faster than most contemporary writing utensils.
Steel dip pens followed quills; they were sturdier, but
still had some limitations. The
individuality of the provenance of a document (see Signature) was a factor also, as opposed to machine font. Cursive was also favored because the writing tool was rarely taken off the paper. The term cursive derives from Middle French cursif from Medieval Latin cursivus, which literally means running. This term in turn derives from Latin currere ("to run, hasten"). Although the use of cursive appeared to be on the decline, it now seems to be coming back into use."