Calculus Made Easy (1914) [pdf]
In Italy there is a "similar" (in the sense that it manages to explain calculus in a friendly and easy manner) book, that has been re-edited and re-published since - I believe - 1929 or so:<p><a href="https://books.google.it/books?id=oHPmx_v1H6QC&pg=PP5&hl=it&source=gbs_selected_pages&cad=2#v=onepage&q&f=false" rel="nofollow">https://books.google.it/books?id=oHPmx_v1H6QC&pg=PP5&hl=it&s...</a><p>the original is French, the Author Gustave Bessiere was an engineer, mathematician and inventor:<p><a href="https://books.google.it/books/about/Le_calcul_intégral_facile_et_attrayant.html?id=d7tKMQAACAAJ&redir_esc=y" rel="nofollow">https://books.google.it/books/about/Le_calcul_intégral_facil...</a><p>I don't think they are (yet) copyright free, though.