This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
In order to keep the ink flowing readily from a drawing pen it must be kept clean and not allowed to stand with the ink in the nibs. A good plan is to have a small piece of velvet fastened to the drawing board or upon a small block, conveniently located where the pen may be drawn across it as in making a line. The tuft of the velvet will clean out the partly dried ink between the nibs. - Contributed by H. L. Woodward, Washington, D. C.