Mechanical Advantage: Tools for the Wild Vertical

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Mechanical Advantage Series by John Middendorf aka Bigwall Scrapbook
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The development of big wall tools and techniques by John Middendorf IV
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USA adoption of pitons 1920s-1939 (part B) East Coast USA 1927-1933 (continuing mechanical advantage series by john middendorf)
Mechanical Advantage series by John Middendorf
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Mechanical Advantage Series by John Middendorf
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Mechanical Advantage Big Wall series by John Middendorf
Mechanical Advantage series by John Middendorf
Mechanical Advantage Series by John Middendorf
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sidebar to the tools and techniques stuff
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Mechanical Advantage Series by John Middendorf
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Mechanical Advantage writings and ramblings by John Middendorf
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Mechanical Advantage: Tools for the Wild Vertical

The history of engineered tools for climbing and alpinism. (Looking for D4 portaledges? See bigwalls.net)
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BigWalls main page
Original Mechanical Advantage posted on bigwalls.net
Mechanical Advantage published in Ascent

Mechanical Advantage: Tools for the Wild Vertical

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