Letter from Frank Keigh, secretary of the late Sir C E [Culling Eardley] Eardley, 35 Wakefield Street, Regent Square, to the Secretary of the Royal Society, London Presenting a pamphlet on small calculating device to facilitate mathematical work. A note at the top of the letter is written by secretary Stokes, dismissing the device from further consideration. [Enclosure not present.] 13 March 1869