What I'm reading right now:
Not all candy is pulled, but much of it is. The process is first the mixture of the ingredients, then the boiling, then the cooling on a slab, and then the pulling. After boiling and cooling, it is a compact mass of dark color. The pulling aerates it and makes it less in weight but larger in bulk, lighter in color and more capable of holding flavor. Until the beginning of this century, candy was pulled only by hand. It required much strength. Candy pullers were hard to get. The work was strenuous and produced perspiration and uncleanliness. It was done with the
bare hands, and it was impossible to avoid danger from eczema and abrasions of the skin of the hands. It was neither appetizing nor sanitary. A good candy puller pull 300 pounds of candy a day. The capacity of the large machines now in use is 2 1/2 tons each, and one man can attend to two machines. Thus since 1900, the art has advanced from a production of 300 pounds a day to 10,000 pounds, with the same labor.
Hildreth v. Mastoras, 257 U.S. 27 (1921), Chief Justice Taft (yes, Taft) writing for the Court.