pounds per square inch (240 kPa).
Operating temperatures range from -30 to 250 degrees Fahrenheit (-35
to 120 degrees Celsius). These pens have an estimated shelf life of
100 years.
There exists a common urban
legend claiming that because a standard ballpoint pen would not work
in zero gravity, NASA spent $11 million developing the zero-g
capable Space Pen, with the humorous note that the Russian space
agency opted to simply use pencils. In fact, NASA programs have
used pencils but because of the danger that a broken-off pencil tip
poses in zero gravity and the high flammability of both the graphite
and wood present in pencils a better solution was needed.
NASA never approached Paul Fisher
to develop a pen, nor did Fisher receive any government funding for
the pen's development. Fisher invented it independently, and then
asked NASA to try it. After the introduction of the AG7 Space Pen,
both the American and Soviet (later Russian) space agencies adopted
it.
Another rumor has it that the
Apollo 11 astronauts accidentally snapped off a switch which was
necessary to permit them to fire the engine to return to the Earth;
and that a Fisher Space Pen was used to press this button.
|