Answer:
What is mortising in chiselling?
Mortising machines are frequently used to cut mortises in wood for mortise and tenon joints.
I hope this helps, L.E.
To explain ethics of examples and teach about a topic and lastly to entertain thoses without tv
The difference is when you draw by memory you won't remember every tiny detail, and you make/draw it in your own way vs. having the object in front of you you can copy it almost exactly.