Sentence:  Thoſe therefore, who are moſt exact in pickling beef for exportation, [...] take their carcaſſes as ſoon as cold, and cut them into proper pieces; and after rubbing each piece carefully with good white ſalt, lay them on heaps in a cool cellar, in a <WSD>drab</WSD> with a ſhelving bottom, where they remain for four or five days, 'till the blood hath drained out of the larger veſſels. 
Meaning of the word marked with <WSD> tags:  A box used in a saltworks for holding the salt when taken out of the boiling pans.