Britain. 1876: invents the basic body rappel in the French Alps; its most useful form, the dülfersitz, is invented in 1910 by Hans Dülfer. 1881: Benedikt Venetz leads Albert Mummery and Alex Burgener on the first ascent of the Aiguille du Grépon, Chamonix, 10-pitches, and the famous 40-foot Fissure Mummery "Mummery Crack", the 5.6 crux, is maybe first-ever grade HS 4b. 1881: Michael Innerkofler and ascend the Kleine Zinne in the Cima Piccola, (Tre Cime di Lavaredo), Sexten Dolomites, at . 1886 : June, W. P. Haskett Smith free soloed the 70-foot Napes Needle (V Diff), in the Lake District of England; this is considered the "birth" of the sport. 1887 : Georg Winkler, aged 17, free soloed the Vajolet Towers (5.5, 7-pitches), initiating the sport in the Dolomites, and the use of hemp-soled sailor's boots. 1892 : Oscar Eckenstein, early bouldering advocate, runs a competition, with cash prizes, among the natives while on an expedition to the Karakoram Mountains. 1892: Steel carabiners appear in the Saxon Switzerland climbing region; they can hold static body weight but are not reliably strong for dynamic leader falls. 1893: Lily Bristow is the first-ever female to summit the difficult Aiguille du Grepon, in Chamonix, France. 1893 : Devils Tower is aid climbed by ranchers William Rogers and Willard Ripley; after 6 weeks they summit on the Fourth of July. 1897: O. G. Jones leads, after top rope, Kern Knotts Crack at VS 4c on the Great Gable in England; potentially the first . 1900s 1900: (approximately) : Oscar Eckenstein demonstrates the concept of modern balance climbing on his eponymous bouldering route in Llanberis Pass, Wales. 1900 : free soloed onsight Piaz Route on Punta Emma, Catinaccio, in the Dolomites, Italy, at 5.7 (7-pitches). 1900 : Heinrich Pfannel, Thomas Maischberger, and Franz Zimmer do the first-ever alpine first free ascent on the Southwest Face of Dent du Géant, in Chamonix, France, bypassing all spikes, ropes, and ladders. 1901 : Michele Bettaga, Beatrice Tomasson, Artolo Zagonel make the first ascent of the South Face of Marmolada, Dolomites, Italy in a day; first big wall climb (5.5, using 4 pitons for anchors on 24-pitches). 1906 : Oliver Perry-Smith, W. Hünig, Rudolf Fehrmann climb Perrykante on Teufelsturm, in the Saxon Switzerland climbing region; 90-feet, Sax VIIb; world's first-ever grade route. 1908 : , J. Klammer, R. Schietzold, F Schroffenegger, make the first ascent of the West Face