Letter, from Frederick Howlett to Sir John Herschel, dated at East Tisted, Alton Autograph letter signed by sender. Is anxious to have an astronomical eye-piece based on John Frederick William Herschel's principles. Encloses communication from Messrs. Horne and Thornthwaite, who would like details for their employee, [W.?] Ackland, to work from. 5 April 1871