Lloyd's Register has digitised and put online the historical editions of the Register of Ships for familiy historians and others to be able to consult the books without travelling to London. This is a wonderful resource for anyone who has shipowning ancestors. The books can be searched in Google Books, and are very clear compared to a lot of books on the Internet Archive and Google Books services.
Editions from 1764 to 1899 are available with a few gaps and omissions. It's an easy cover page which allows you to navigate into and out of the books very easily. So impressed that they have made this a free service - well done Lloyd's Register!