Regular users had to apply in writing and be issued a reader's ticket by the Principal Librarian. During the period of the British Library, access was restricted to registered researchers only; however, reader's credentials were generally available to anyone who could show that they were a serious researcher. The Reading Room was used by a large number of famous figures, including notably Sun Yat-sen, Karl Marx, Oscar Wilde, Friedrich Hayek, Marcus Garvey, Bram Stoker, Mahatma Gandhi, Rudyard Kipling, George Orwell, George Bernard Shaw, Mark Twain, Vladimir Lenin (using the name Jacob Richter), Virginia Woolf, Arthur Rimbaud, Mohammad Ali Jinnah, H. G. Wells and Sir Arthur Conan Doyle.