Nib (pen)
Videos
A nib is the part of a quill, dip pen, fountain pen, ball point or stylus which comes into contact with the writing surface in order to deposit ink. Different types of nibs vary in their purpose, shape and size, as well as the material from which they are made.
Quill pen and ink bottle
Metal nib by Perry & Co.
Detail of a Visconti stainless steel fountain pen nib and feed
Tip of a fountain pen nib
Capillary action
Videos
Capillary action is the process of a liquid flowing in a narrow space in opposition to or at least without the assistance of any external forces like gravity.
Capillary water flow up a 225 mm-high porous brick after it was placed in a shallow tray of water. The time elapsed after first contact with water is indicated. From the weight increase, the estimated porosity is 25%.
Moderate rising damp on an internal wall
Capillary flow experiment to investigate capillary flows and phenomena aboard the International Space Station
Water height in a capillary plotted against capillary diameter