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The Phillips Machine (on display at the Science Museum, London and other 
places) which developed into the Proportional-Integral-Derivative 
theoretical Phillips Curve and an early version of the Lucas Critique 
reflects the influence of engineering on economics in the second half of 
the twentieth century.  See chapters 14, 16, 17, 18, 41 and in particular 
Charles Holt's chapter (33) on 'Interactions with a Fellow Research 
Engineer' in A.W.H. Phillips: Collected Works in Contemporary Perspective 
(Cambridge University Press, 2000) plus Allen, R.G.D. The Engineer's 
Approach to Economics (Economica May 1955 : 158-168).   
 
See also Arnold Tustin's The Mechanisms of Economic Systems - An Approach 
to the Problem of Economic Stabilisation from the Point of View of 
Control-System Engineering (Heinemann 1954).     
 
Robert Leeson 
Murdoch University 
 
 
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