Letter, from Wilhelm Struve to Sir John Herschel, dated at Altona Autograph letter signed by sender. Sends letter from 'chronometer expedition' in Baltic Sea under the leadership of [T. F.] Schubert and supported by the Prussian, Danish, and Swedish governments. Mentions talk written for a larger audience in French publication. Envies John Frederick William Herschel's opportunity to observe the southern hemisphere. 13 August 1833