Sentence:  Many days have I spent watching the female <WSD>spallers</WSD> breaking the stones. In the year 1899 I started to work at Dolcoath but there were not many <WSD>spallers</WSD> there then as they had just put in crushers which were worked by steam. 
Meaning of the word marked with <WSD> tags:  A person who breaks down stone into smaller pieces.