The Waterman Edson is named in honour of the founder of the company. The Edson is an exception pen in the design as well as materials and workmanship.
Fountain pens are amazing creations
Fountain pens are fascinating. You may look at a fountain pen and think: what's so complex about this thing? Well there is a high degree in complexity in the pen ans the nib. The pen itself has many different parts each needing to be cut a precise size. Each part whether it be a ring or a section that screws into another must be precise. A pen is very tactile. If there is anything not right, you will feel it in you hand.
There are two things about owning a fountain pen that make it very different from the disposable ball point pen. First, it becomes "your" pen. You carry it around with you. It becomes one of your possessions. It generally is not an item that you lend out to others. Second, the writing experience comes down to the experience of the nib and the ink flowing across the paper.
Pens in some form have been around for a long time. Whether quills, or sticks with iron nibs for dipping, pens have been an important part of communication. In terms of actual pens, at first they pens had a steel nib, then dipped in ink. The writer would use ink bottles, blotting powder or pape and a writing desk - possible, but not really that mobile.
The next major innovation had the pen hold a supply of ink. An eye dropper was used to fill the body of the pen with ink. The first pens generally had problems. In 1870 Lewis Edson Waterman invented the now famous system to control the flow of ink from the ink chamber to the nib. He developed a three-channel feed that would allow air to travel up into the ink chamber while ink flowed out.
Since that time there have been innovations in terms of the materials used to make the pens, however, the basic workings of the pen remain fairly consistent.
The links below provide further information about fountain pens.