Orton's lightning calculator and accountant's assistant. This book, "Orton's lightning calculator and accountant's assistant. Volume 2", by Hoy D. Orton, is a replication of a book originally published before 1871. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.