Mr. Geo. S. Parker invented, patented, and trade-marked what has proven to be the most practical, and most simple, and probably the best working pen yet produced. It was given the name of Parker “Lucky Curve™ because of the peculiar curve of the feed bar containing the ink channel. This “Lucky Curve” has done away with one of the chief annoyances of fountain pens—that of the ink leaking out and collecting on the finger grip when the pen is not in use.
In the Parker Pen the feed bar is curved so that it touches the inner wall of the ink reservoir. By means of this contact, all ink is drained out of the ink-channel, by capillary attraction, back into the ink reservoir, leaving a free passageway for the expanding air to escape. The air expands due to the heat from the body and must escape thru the ink channel. Obviously if the channel contains ink, this ink must be forced out, and it oozes out around the finger grip. This is the cause of so many inky fingers, and thus it can be seen that the Parker Lucky Curve made a really practical stride forward in scientifically overcoming the chiefs of all fountain pen evils.
In the thirty years that Parker Pens have been manufactured, various other refinements have been made. The Parker self-filling mechanism, elsewhere described, has certain features which are sure to appeal to everyone who is familiar with the rights and wrongs of fountain pen construction. In the barrel of the Parker Pen, for example, there are no slots or cuts, no levers or projections of any kind. The barrel is ink tight—safety sealed—a feature which no other self-filling pen has. The lever which squeezes the rubber ink sac comes out at the top of the barrel in the form of a button, covered by an ink-tight safety cap. To fill the pen, simply immerse the point in ink, press the button and release it, retain the pen in the ink for two or three seconds, and it is filled.