Fisher Space Pens (Gifts for Kids)Fisher space pens - designed to work on earth, in outer space, and everywhere in between.
About Fisher Space Pens
In 1953 Paul Fisher invented a ¨Universal Refill¨ for ballpoint pens - which solved a vexing problem at the time: there were dozens of pens on the market, each with their own proprietary refills. Shop owners embraced it, as it allowed them to reduce the number of refills they needed to stock.
Bolstered, Fisher continued to work on making an even better refill. He eventually perfected a refill using thixotropic ink: semi-solid until the shearing action of the rolling ball liquefied it, that would flow only when needed. The cartridge was pressurized with nitrogen so that it didn´t rely on gravity to make it work. Dependable in sub-zero tempertures as well as sweltering desert heat, it could also write underwater and upside down.
Fisher's development coincided with the Mercury and Gemini space missions, and The Fisher cartridge worked in the weightlessness of outer space. The astronauts, beginning with the October, 1968 Apollo 7 mission began using the Fisher AG-7 Space Pen and cartridge developed in 1966.
Fisher Space Pens are still made in the U.S.A.