Here's two bits about unicycles from the 1880's
'Unicycle (ca. 1882)' (http://tinyurl.com/d5ama)
'Can it be that the coming machine is to be a unicycle?'
(http://tinyurl.com/dwmh6)
Greg Harper has assembly drawings of his hub at 'The Home Of Harper'
(http://staff.washington.edu/gharper/)
'Frank Bonsch (a.k.a. Unifrank)'
(http://www.people.freenet.de/unifrank/index_engl.htm) has a CAD drawing
of his 'planetary gear hub'
(http://www.people.freenet.de/unifrank/hub_engl.htm). His hub was made
with parts and gears from a broken Shimano Nexus hub.
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