2. Then examine different priced fabrics of the same kind and see whether the low or high priced fabric has the greater density.
Experiment 35—Determining Weight
Apparatus: Balances, die.
Materials: 4 square inches of cloth.
Reference: Textiles, page [239].
Directions
1. Fabrics are bought and sold by the yard. In order to express the amount of wool or cotton in a fabric the weight in ounces per yard is usually given.
2. In order to find the number of ounces per yard a piece of cloth of definite size, usually about 4 sq. in., is stamped out by means of a die, or cut by means of a tin plate exactly 4 sq. in. (2 in. on the side). This is then weighed on very accurate balances and expressed in grains. Find the weight per yard. Remember 7000 grains equal 1 lb.; 16 oz. equal 1 lb.
Experiment 36—Determining Shrinkage
Apparatus: Hot water.
Material: Sample of woolen fabric.
Reference: Textiles, page [239].