Helen, yes, find my past.
If you go into the Newspaper Archive and search for surname Sellars with Lockwood in the Keyword box you get the 700 odd answers.
You can do this without a subscription and see the scope of the answers. You will need a subscription to see the full original articles.
Happy Reading
Dave
Edit, sorry, should have added that you should restrict the search to Sheffield Newspapers and time period 1850 to 1900.