Sentence:  For when Henry Killigrew was come from the Queen of England to comfort her. . .this gentleman stranger's hap was to spill the play, and <WSD>unvisor</WSD> the disguising; for when he was, by the Queen's commandment, come to the Court, though...he did nothing hastily, yet he came in so unseasonably before the stage was prepared and furnished, that he found the windows open and the candles not lighted, and all the provisions for the play out of order. 
Meaning of the word marked with <WSD> tags:  To reveal; to unmask or unveil.