The farmers of George Washington's day had no better tools than had the farmers of
Julius Caesar's day - in fact - Roman ploughs were superior to those in general use in
America eighteen centuries later.
Plow - John Deere
John Deere invented the self-polishing cast steel plow.
Plumbing Related
Learn about ancient and modern plumbing from around the world - bathes, toilets, water
closets.
Pneumatic Related
A pneumatic device is any of various tools and instruments that generate and utilize
compressed air.
Pogo Stick
Legend and history of the jumping toy.
Polaroid Photography
Polaroid photography was invented by Edwin Land.
Police Technology
The methods and techniques of, and the equipment available to, police agencies.
Polio Vaccine
History of the polio vaccine and biography of polio researcher Jonas Salk.
Polyester
Polyethylene terephthalate created synthetic fibers such as polyester dacron and
terylene.
Polygraph
John Larson invented the polygraph or lie detector in 1921.
Polystyrene
Polystyrene is a strong plastic created from erethylene and benzine that can be injected,
extruded or blow molded, making it a very useful and versatile manufacturing material.
Polyurethane
Polyurethane is an organic polymer that can be injected, extruded, or blow molded;
making it a very useful and versatile manufacturing material.
Pom Poms
Pompoms and the history of cheerleading innovations.
Popsicle
The history of the popsicle.
Postal Related
William Barry invented the postmarking and canceling machine. William Purvis invented
the hand stamp. Philip Downing invented the letter-drop letter box. Rowland Hill invented
the postage stamp.
Post-It Notes
Arthur Fry invented Post-It Notes as a temporary bookmarker.
Potato Chips
Potato chips were invented in 1853.
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(Ron)
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