Space Pen
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The Space Pen, marketed by Fisher Space Pen Company, is a pen that uses pressurized ink cartridges and is able to write in zero gravity, underwater, over wet and greasy paper, at any angle, and in a v
An AG-7 Astronaut Space Pen in presentation case
Bullet pen
Astronaut Walter Cunningham, Apollo 7 lunar module pilot, writes with space pen as he is photographed performing flight tasks on the ninth day of the Apollo 7 mission.
Close up of a Fisher Space Pen body showing knurlings with removed refill adjacent
Thixotropy
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Thixotropy is a time-dependent shear thinning property. Certain gels or fluids that are thick or viscous under static conditions will flow over time when shaken, agitated, shear-stressed, or otherwise
Space Pen
…wide range of temperatures. The Fisher Space Pen was created by Austrian Friedrich Schächter and expanded by Erwin Rath. Paul C. Fisher invented the "thixotropic special ink". The pens are manufactured in Boulder City, Nevada. Paul C. Fisher first patented the AG7 "anti-gravity" pen in 1965. There are two prominent…
Mānuka honey is an example of a thixotropic material.
Quicksand on the shore of the River Thames. Quicksand demonstrates thixotropy in the form of shear thinning, in that it is solid when at rest, but quickly liquefies when agitated.