Letter, from Samuel Newington to Sir John Herschel, dated at 10 Upper George St. Autograph letter signed by sender. Is grateful for John Frederick William Herschel's opinion. Can hardly imagine that such a simple contrivance should answer the purpose. Saw the patent agent who has offered to send a list of all the writings on the subject. Also brought the matter before B. C. Brodie (the elder), who now seems totally blind. 5 January 1860