Letter, from R. Wilcox to Sir John Herschel, dated at Lucknow [India] Autograph letter signed by sender, with annotations by recipient. New magnetic observatory to be established in India. Instrument, made by [T. R.] Robinson and Mr. Newman, will be sent to Royal Society [of London] for examination and testing before shipment. Questions best times for daily barometer observations. 17 October 1840