Early drawing pens were made similar to forceps, with a screw to adjust the distance of the two legs which held the indian ink. I remember the time when the two legs even had to be smoothed with a honing stone to undo the waering from the very harsh paper. For my map drawing I also had a double pen (for streets) and a free wheeling pen for altitude curves (isohypses).

Early drawing pens were made similar to forceps, with a screw to adjust the distance of the two legs which held the indian ink. I remember the time when the two legs even had to be smoothed with a honing stone to undo the waering from the very harsh paper. For my map drawing I also had a double pen (for streets) and a free wheeling pen for altitude curves (isohypses).