Inskipp and Mackenzie
1864 Robert Davison entered into a partnership with George Scamell, F.R.I.B.A., as Davison and Scamell
1870 On the expiration of this partnership, Mr. Davison practiced singly
1875 Richardson took into partnership his youngest son, Robert Davison, Assoc. M. Inst. C.E., and John Mackenzie, M. Inst. C.E., who had been associated with him for some twenty years previously.
1881 Mr. Davison, jun., accepted an appointment abroad, and the firm was joined by George Inskipp, A.R.I.B.A., Mr. Davison, Senior, owing to advancing years and failing health, practically retired from the business.
1886 After Mr Davison's death the business became Inskipp and Mackenzie.