British Newspapers 1800-1900   http://newspapers.bl.uk/blcs/

This is rather good. The British Library has scanned and made available content from over 2 million British newspapers from the 19th Century.  You have to pay to see most of them, but the prices aren’t exorberant, and two newspapers The Graphic and the Penny Illustrated Paper are completely free to look at.  You could look for Saucy Jack and the Whitechappel murders but I chose to look for Gilbert & Sullivan and found some most excellent first night reviews.