From the 18 century onwards the Academies were dominant in teaching drawing. Full time tuition that was almost exclusivly in the Academies of art around 1800.
The French Academic Manner was Dominant and spread worldwide/ French Academy (founded round 1645).
There where big Academies adapting the French teaching methods in Berlin , Vienna, Rome, Antwerp and Brussels. In general from 1800 onwards everywhere people learned drawing first starting to copy from pictures then plasters casts and then from life. Composition was studied in Picture Galleries like the Louvre.
Before that drawing was also taught in all particular private studios. Students from the age of 9 started copying small fragments like eyes and noses and the progressed towards more complex tasks. In these Ateliers or studios people had to learn how to work in the style of the masters so to help in the production of the master.
In general there are differences between French, Italian, Dutch and German drawings and different studios give all a specific stylised return/ also different materials where used per country , for instance Dutch masters worked with Reed pen and Italian drawings where made with Quill pens.
In Academic drawing there is the difference between Baroque drawing (focussing on linework) and Nineteenth century drawing focussing on tonal valyes.
Anyhow, there seemed to me like there is almost underneath everydrawing a solid underdrawing some kind of enveloppe or big shape and in finished drawings there was knowledge of tonal values.
The 18th and nineteenth century Academies systemised all knowledge and augmented knowledge. What they however also advocated and taught was stylising and idealising the reality trough the examples of Greek art wich was since Renaissance unwards seen as the best example of high art.
Accuracy is best achieved by following a good method and working everyday as much as possible.