Derailleur gears designed and built in the late 19th century. One example is the Protean two-speed derailleur available on the Whippet safety bicycle. The French bicycle tourist, writer and cycling promoter Paul de Vivie (1853–1930), who wrote under the name "Vélocio", invented a two speed rear derailleur in 1905 which he used on forays into the Alps. Some early designs used rods to move the chain onto various gears. 1928 saw the introduction of the "Super Champion Gear" (or "Osgear") from the company founded by champion cyclist Oscar Egg, as well as the Vittoria Margherita; both employed chainstay mounted 'paddles' and single
Interrogative word Interrogative word An interrogative word or question word is a function word used to ask a question, such as "what", "when", "where", "who", "whom", "why", and "how". They are sometimes called wh-words, because in English most of them start with "wh-" (compare Five Ws). They may be used in both direct questions ("Where is he going?") and in indirect questions ("I wonder where he is going"). In English and various other languages the same forms are also used as relative pronouns in certain relative clauses ("The country where he was born") and certain adverb clauses ("I go where he goes").