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This wiki recently had its software upgraded. Existing members, please use the email below. Please send email to manager A T citizendium.org . to request an account on this new server. Article creation with subpages is not possible yet. Please report issues in the Forum. Help Write Articles about our World Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We write the kinds of encyclopedia-style articles that Wikipedia and other sites can't write. We regard information as a public good and welcome anyone who wants to share their knowledge on virtually any subject. Our online community prides itself on being congenial and supportive. Our goals have changed. Please read about who we are in 2022. See Recent Changes—an overview of articles we are writing now. Please help today! Please make your donations here. Donations go to keep our servers running. See our financial report. Become a member--it's free! Join via our application form (Google Account required) Start a new article Improve existing articles Quick Start | How to collaborate | How to format pages Wikipedians are very welcome! Read our policies. We strive for objectivity. We prefer new material but importing is allowed in certain conditions. See articles considered ready for reading. We are a partner site with Physics Forums; see this. Browse articles by area of interest: Agriculture Earth Sciences Journalism Physics Anthropology Economics Law Politics Archaeology Education Library & Info. Sci. Psychology Architecture Engineering Linguistics Religion Astronomy Food Science Literature Robotics Biology Games Mathematics Sociology Business Geography Media Sports Chemistry Health Sciences Military Theater Classics History Music Topic Informant Computers Hobbies Philosophy Visual Arts Our help system and forum Questions and answers to help you find the information you need

Some of our finest Citable Articles (145) Developed Articles (1,147) (17,529 total articles) Who dares to teach must never cease to learn. — John Cotton Dana (1856–1929), American librarian and museum director.        —add a quotation about knowledge or writing Featured Article: Caterpillar Club/Citable Version The Irvin pin. The eyes have always been red, but there are urban legends about the meanings of other colors. A pin from another company, possibly Switlik or Standard Parachute. This style is common in catalogs and auctions of military memorabilia. The Caterpillar Club is an informal association of people who have successfully used a parachute to bail out of a disabled aircraft. After authentication by the parachute maker, applicants receive a membership certificate and a distinctive lapel pin. History Before April 28, 1919 there was no way for a pilot to jump out of a plane and then to deploy a parachute. Parachutes were stored in a canister attached to the aircraft, and if the plane was spinning, the parachute could not deploy. Film industry stuntman Leslie Irvin developed a parachute that the pilot could deploy at will from a back pack using a ripcord. He joined the Army Air Corps parachute research team, and in April 1919 he successfully tested his design, though he broke his ankle during the test. Irvin was the first person to make a premeditated free fall jump from an airplane. He went on to form the Irving Airchute Company, which became a large supplier of parachutes. (A clerical error resulted in the addition of the "g" to Irvin and this was left in place until 1970, when the company was unified under the title Irvin Industries Incorporated.) The Irvin brand is now a part of Airborne Systems, a company with operations in Canada, the U.S. and the U.K.[1]. An early brochure [2] of the Irvin Parachute Company credits William O'Connor 24 August 1920 at McCook Field near Dayton, Ohio as the first person to be saved by an Irvin parachute, but this feat was unrecognised. On 20 October 1922 Lieutenant Harold R. Harris, chief of the McCook Field Flying Station, jumped from a disabled Loening W-2A monoplane fighter. Shortly after, two reporters from the Dayton Herald, realising that there would be more jumps in future, suggested that a club should be formed. 'Caterpillar Club' was suggested because the parachute canopy was made of silk, and because caterpillars have to climb out of their cocoons and fly away. Harris became the first member, and from that time forward any person who jumped from a disabled aircraft with a parachute became a member of the Caterpillar Club. Other famous members include General James Doolittle, Charles Lindbergh and (retired) astronaut John Glenn. In 1922 Leslie Irvin agreed to give a gold pin to every person whose life was saved by one of his parachutes. By 1945 the number of members with the Irvin pins had grown to over 34,000. In addition to the Irvin Air Chute Company and its successors, other parachute manufacturers have also issued caterpillar pins for successful jumps. Irvin/Irving's successor, Airborne Systems Canada, still provides pins to people who made their jump long ago and are just now applying for membership. Another of these is Switlik Parachute Company, which though it no longer makes parachutes, still issues pins. Footnotes Continued...