Fisher’s
Sealed, Pressurized
Ink Cartridge
Ordinary ball pens
rely on gravity
for ink fl ow, but
Fisher's Space Pen
cartridge, pressurized
at nearly 35 pounds
per square inch, feeds
ink continuously to the
tungsten carbide ball, allowing
the user to write at any angle,
even upside down. This advancement
required the development of a
new and special ink.
The new visco-elastic, thixotropic
ink, with a consistency
similar to that of
thick rubber cement,
fl ows as a result of
the shearing action
of the rolling ball
in its socket. The
shearing action liquefi es
the solid gel thixotropic
ink, allowing the pen to
write smoothly and dependably
on most surfaces and
even underwater.
Evaporation, wasted ink
and back leakage are
eliminated. Shelf-life is
increased to an estimated
100 years. | 1
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