Various watch-making and Collectors' books including; The Rev. H.L. Nelthropp, A Treatise of Watch-work Past and Present, London 1873, Paul N. Hasluck, Clock and Watch Jobbing, London, 1889; Thomas Charles Scotchford, A Treatise on the Detatched Lever Escapement, London 1866, 19 pls.; F.J. Britten, On the Springing and adjusting of Watches, London 1898; E.A. March, The Evolution of Automatic Machinery as applied to the manufacture of Watches, Chicago, U.S.A., 1896; A. Gideon Thisell, The Science of Watch Repairing Simplified, Chicago.