If you are talking of the pens in which two blades are separated by a rotating wheel and worm which adjusts the width of the points and thus the width of the line (the paint sits loose between the ponts held there by by surface tension), I can't recal their name 25 years after the event. However I do remember they are a devils job to use. I also have an suspicion they would be difficult to use on anything other than paper. You need the "suction" of the paper to draw the paint from the pen.They tend to "glob" at the best of times. They would be available from a graphic supply shop.(well they were last century anyway
) I have an inkling they were called something pens. Maybe paint pens? (thats gonna bug me all day!)
The other pens we used were the graphic pens made by Rotring which had very fine nozzles but required the appropriate ink to use them and again would only work well on paper, to draw the ink out.
as with most fine tools you really get what you pay for. try and find someone with a haff or a kern bow pen and see how it feels. kern are no longer in business but haff are still going strong.
they do have an interesting interpritation to "import duty" which i think is a downright con but you either pay it and get your pen or dont. when you see the prices on the website, multiply them by 2 to get an idea of what they will charge you.
the other type is the bob moore lining pen.
i use the bow pen for flat sided coaches and the bob moore for doing panelled work.
i did have a photo showing the 2 but it was on my previous image hosting site that has gone caput.
i will take another for you.
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