Letter from T Cooke & Sons, opticians, mathematical & astronomical instrument makers, 31 Southampton Street, Strand, London, to Lieutenant General E [Edward] Sabine, President of the Royal Society, London Assuring the continued high quality of their manufacture, especially in optics, after the senior partner's death. The company announces their willingness to construct the equatorial telescope for the Society and gives an estimate of the costs for construction of the telescope and similar instruments. 27 January 1869