Could you please tell me what this drawing type and technique are called?

How is this kind of skeletal development known as? Architectural drafting, as seen within the picture. these very strictly geometric, exact drawings are made. Not as a result of free, quick hand and listed below are very straight and really clear geometric sketches. Additionally, may you advocate any assets, akin to books or programs, for additional studying?

I perceive that proven on picture is expounded to the cathedral development theory- that's clear; I imply the strategy of setting up this framework itself.