The book may have numerous typos or missing text. It is not illustrated or indexed. However, purchasers can download a free copy of the original rare book from the publisher's website. You can also preview the book there. Purchasers are also entitled to a trial membership in the publisher's book club where they can select from more than a million books for free. Publisher: Published and sold at the Commissioners of patents sale department Publication date: 1886 Subjects: Electric apparatus and appliances; Magnetic instruments; Patents