Why did Harrison invent the pen with feathers in 1780?

In fact, there has been no conclusion about "the real inventor of the pen". 1780, Harrison, a ring technician in Birmingham, England, also made the prototype of today's pen tip by hand. When a pen is fitted with a nib, people feel that writing becomes smooth. After that, most pens were fitted with slit tips made of metal sheets, which had different holes and folds for temporarily storing ink. Because of the high price of nib, the patent of metal nib was born. 1809, a water storage pen similar to today's pen was born in Britain. That year, Britain issued the first batch of patent certificates about water storage pens. Before this, most water storage pens could not flow automatically, and the writer needed to press the piston to control the ink. Until 1950s (19), some American pen makers combined iridium gold nib, hard rubber and free-flowing ink to make today's pens. 1822, john mitchell, Birmingham, England began mass production of pens with metal tips. These dip pens have gorgeous handles and golden tips. The gold nib was not just a decoration. According to the records of the pen dealers at that time, only gold with stable chemical properties could resist the erosion of the rough ink formula at that time. In order to prevent the gold nib from wearing too fast, the factory welded a small, hard and corrosion-resistant iridium bead on the nib, which is also known as the "iridium pen".