NOTATIO

Back then everybody was taught to write with right hand, what is actually easy to accomplish.

If you're an engineer or architect you learn to letter...or write...with the paper taped to your desk square and upright. No slant to the letters either. For block lettering many use a drafting triangle to all the verticals are perfectly 90degrees. Adjustable triangles are doubly useful since they have a handy knobs to hold it by.