Sentence:  ...consider that this perfect work was done on a wooden press, that the form was inked by hand with <WSD>inkballs</WSD> or "daubers,"... 
Meaning of the word marked with <WSD> tags:  A leather-covered dauber, stuffed with soft, resilient wadding, with a wooden handle, used to ink type forms for printing. A predecessor of brayers and self-inking presses.