The book has no illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from the publisher's website (GeneralBooksClub.com). You can also preview excerpts of the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Title: A Letter to the Board of Visitors of the Greenwich Royal Observatory in Reply to the Calumnies of Mr. Babbage at Their Meeting in June 1853, and in His Book Entitled the Exposition of 1851; Original Publisher: London, Printed by G. Barclay; Publication date: 1854; Subjects: Telecommunication/ History/ Bibliography; History; Telecommunication; Technology