Nisbet or Nesbit?
Dr Euan Cameron of the North British Railway Study Group produces superb coloured drawings of that railway's locomotives. He appears to have almost by accident unearthed a long-standing error in at least two major works of reference, namely Ahrons British steam locomotive 1825-1925 and Riemsdijk Compound locomotives, both of which ascribe a system of tandem compounding to Nesbit, whereas it should probably be Nisbet as used by Euan Cameron without comment. Furthermore there is an obituary of a Glasgow-born, Holmes trained Nisbet who went to India and died young: sadly the obituarist did not mention the tandem compound.
See NBRSG Journal Number 43 pp. 12-19 and references therefrom