1) Simple machine
Found on
https://www.crosswordclues.com/clue/scrollerwheel
A scrollerwheel is a mechanical device composed of a number of rollers (four or more) and connective bands under tension, which wrap around and weave between the rollers forming a self-supporting cluster possessing a central roller. The cluster of rollers is bound by the connective bands in such a way that the static friction between the rollers a...
Found on
http://en.wikipedia.org/wiki/Scrollerwheel
No exact match found.
