Draft letter, from Sir John Herschel to Wilhelm Struve Draft letter. Asks Wilhelm Struve for account of the performance of his new [Josef] Fraunhofer telescope. Corroborates Wilhelm Struve's double star motion data, except for 70 Ophiuchi, where John Frederick William Herschel and [James] South find no motion. Asks for observational targets and urges care in Wilhelm Struve's observational technique. Mentions Wilhelm Struve's intention to undertake celestial zone with [F. W.] Bessel. Describes [Henry] Kater's 'floating collimator.' 24 January 1825