He winds it on bobbins with a rapid reciprocating motion, so as to lay the fibre in diagonal lines.
These bobbins are then in general taken to the first spinning frame, and there the single strands receive their first twist, which rounds them, and prevents the compound fibre from splitting up and separating when, by the subsequent scouring operations, the gum is removed which presently binds them into one.
Bobbins to the number of strands which are to be twisted into one are mounted in a creel on the doubling frame, and the strands are passed over smooth rods of glass or metal through a reciprocating guide to the bobbin on which they are wound.
The spinning or throwing which follows is done on a frame with upright spindles and flyers, the yarn as it is twisted being drawn forward through guides and wound on revolving bobbins with a reciprocating motion.
From these bobbins the silk is reeled into hanks of definite length for the market.
The machine is fitted with 20 to 40 of these bobbins placed side by side, and its product is known as " slubbing roving," it being now a soft, thick thread of silk, measuring usually either 840 or 1260 yds.
Fancy cotton goods are of great variety, and many of them have trade names that are used temporarily or occasion produced on the surface of the cloth by needles placed in a sliding frame; lustre, a light dress material with a lustrous face sometimes made with a cotton warp and woollen weft; zephyr, a light, coloured dress material usually in small patterns; bobbinnet, a machine-made fabric, originally an imitation of lace made with bobbins on a pillow.
Lucy Larcom,' born in Beverly, came to Lowell in 1835, where her widowed mother kept a " corporation " boarding-house, and where she became a " doffer," changing bobbins in the mills.
The resistance coils themselves are generally wound on brass or copper bobbins, with silk-covered manganin wire, which should first be aged by heating for about ten hours to a temperature of 140° C., to remove the slight tendency to change in resistivity which would otherwise present itself.