Sentence:  It consists of seventy fine spun cotton threads, <WSD>gimped</WSD> or tied around with thread by a machine similar to that for wrapping bonnet wire. 
Meaning of the word marked with <WSD> tags:  (of yarn, cord, thread, etc.) To wrap or wind (surround) with another length of yarn or wire in a tight spiral, often by means of a "gimping machine", creating 'gimped yarn', etc. Also, generally, to wrap or twist with string or wire. "See" '''gimped'''.