t the periphery of the disk bars are connected by a cross bar, and stretched from throughout its entire cycle. The top and bottom walls this to a shaft or roller mounted above the door or are also so arranged as to provide a snug fit along the window which is to be screened, is the fabric of the… … movement described above. That is, the upper end of attempt to run away before injury is done to the ani- the spindle describes a circle about the block while the upper and lower faces of the disk roll respectively a crank lying within easy reach of the operator, and along the top and bottom walls…
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![An illustration from Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)](https://img.insideoutlibrary.com/img/200/ia-rudimentsofartof00bull-80-52.webp)
