Take a look at this photo of a gazillion ladies in an Atwater Kent radio factory [circa 1925] in Philly, PA.
Seems they are assembling capacitors on motorized spooling equipment.
This is a large 2300 x 1846 (893 KB) JPEG image.
Warning: bandwidth alert
http://www.shorpy.com/node/4785?size=_original
This is a smaller 512 x 411 (65 KB) JPEG version of the same photo.
http://www.shorpy.com/node/4785