Note 20 — Chapter IX
Reading edition
Seven-ounce duck is made, but it is not much heavier than drilling, and since it is little used it is not easily found for sale. United States army wall-tents are made from a superior quality of ten-ounce duck, but they are much stouter than is necessary for summer camping. There are also "sail-ducks," known as "No. 8," "No. 9," &c., which are very much too heavy for tents.