Sentence:  The threadings most used are twill and the two return twills we know as “<WSD>birdeye</WSD>” and “gooseeye,” and may be threaded single in a coarse warp set at six ends to the inch or in carpet warp set at twelve ends to the inch and threaded double, as shown on Diagram 59. 
Meaning of the word marked with <WSD> tags:  A reverse twill weave, or cloth made with that weave.