i came across the word jenny--a spinning jenny, in an artical about luddites..and went to look up jenny. why jenny i thought?

there is nothing! (well, i happen to have most of my dictionaries packed at the moment) Jenny in Webster's New World Dictionary list spinning jenny first, and then mentions jenny is used for female (a jenny bird)
and when i chech out spinning.. no jenny at all

Jenny i also paired with knitting, a simple knitting machine is a knitting jenny.. but it still doesn't answer the question of jenny.
and are there others? besides spinning and knitting?


my other obsession