| | literature : Perpetual Revolution (Site not responding. Last check: 2007-10-29) |
 | | Still, one of the reasons Van Kannel gave why the wings of his doors had to be able to fold back and open a clear passageway was "to provide for the circulation of air in the event of. |
 | | In his patent application, in fact, Van Kannel never raises the issue of velocity at all: for him, the strips "bearing against the inner faces of [the] segmental side portions of the structure," derive their rationale entirely from their function as guards against air leakage and, somewhat incidentally, caught fingers. |
 | | A copy of Van Kannel's original patent and of the materials pertaining to the award of the John Scott medal were kindly provided to me by the curatorial department of the Franklin Institute in Philadelphia. |
| web.mit.edu /lit/www/spotlightarticles/revolution.html (6350 words) |