Flat Underwear.—Goods knitted in plain stitch.
Fleece-lined.—Applied to a variety of heavy-weight undergarments knitted with three threads—namely, face yarn, backing yarn, and a third thread of yarn tying the face and back together. The heavy nap or fleece is produced by running the cloth through wire rolls, called brushers. The term "fleece-lined" is often misapplied to ordinary single-thread underwear which has been run through the brushing machine for the purpose of raising a light nap on the inner surface.
Floconné.—Having small flakes, in white or colour.
Florentine Drills.—When a Drill is woven with a twill weave it is known as a Florentine Drill, to distinguish it from Satin Drill, which is woven with a warp-faced sateen weave.
Folded Yarn.—Folded Yarn is produced by twisting together two or more single yarns. When two single threads are twisted together the Folded Yarn produced would be called a "two-fold." If the single yarn used in producing the "two-fold" yarn was of 40's count (that is to say, of yarn of which it took 40 hanks of 840 yards to weigh 1 pound), the "two-fold" yarn produced would really become equivalent to 20's count (that is to say, it would take 20 hanks to weigh 1 pound); however, it would not be referred to as being a 20's count, but as a two-fold forties and designated 2/40's. All Folded Yarns are designated by two sets of figures separated by a line, which shows on one side the number of threads folded together and on the other the "count" of the single threads thus folded together. By dividing the number of the single threads into the counts the actual number of hanks of the Folded Yarn per pound is ascertained thus:—
| Two-fold 40's, | written | 2/40 | = | 20 | folded | hanks | per | pound. |
| Three-fold 30's, | " | 3/30 | = | 10 | " | " | " | " |
| Three-fold 60's, | " | 3/60 | = | 20 | " | " | " | " |
| Four-fold 60's, | " | 4/60 | = | 15 | " | " | " | " |
| Four-fold 120's, | " | 4/120 | = | 30 | " | " | " | " |
All Folded Yarn is not composed of single threads of the same count. Where such Folded Yarns are met with, and when it is desired to ascertain the number of hanks of such Folded Yarn per pound, the simplest way to proceed is to take the highest count and divide it first by itself and the other counts in succession, then divide the sum of the various quotients into the highest count, and the answer will be hanks per pound:—
| 30 ÷ 30 | = | 1 | ||
| 30 ÷ 20 | = | 1½ | ||
| — | ||||
| 2½ ) | 30 | |||
| 12 | Answer. |