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
Word sort to help students who do not have extensive reading vocabularies focus on isolated sounds (Initial, final, or medial) within a spoken word. These sorts are often a child’s first introduction to word study and are most commonly used with students whose developmental skills are at the emergent, letter name-alphabetic, or early within word Spelling Stages. Word sort activities involve students comparing, contrasting, and classifying words - considering words from a variety of perspectives. Bear et al. emphasized the importance of comparing those words that do fit into a particular category with those that don't. This type of engagement with words