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. Volume: 9, pt. 1; Original Publisher: American Gas Institute; Publication date: 1916; Description: United States patents relating to gas. Issued from October 1, 1905-to September 30, 1906; Subjects: Gas manufacture and works; Gas; Technology