You all seem to be talking about the Newlyn-Phillips hydraulic machine which simulated the circular flow with coloured water. See Mary Morgan, *The World in the Model* (2012), chapter 5. This is Bill Phillips, of Phillips Curve fame, who was already a full professor at the LSE. 

All best, Avner

======================================================
From Avner Offer, Chichele Professor Emeritus of Economic History, University of Oxford
  All Souls College, High St., Oxford OX1 4AL, tel. 44 1865 281404
 email: [log in to unmask]
 personal website:
 http://sites.google.com/site/avoffer/avneroffer
________________________________________
From: Societies for the History of Economics [[log in to unmask]] on behalf of Robert Leeson [[log in to unmask]]
Sent: 25 March 2014 05:59
To: [log in to unmask]
Subject: Re: [SHOE] Circular flow

An LSE undergraduate performed a similar feat - celebrated 60 years later in a MONIAC Special Edition of Economia Politica (December 2011).

RL

----- Original Message -----
From: "David Hammes" <[log in to unmask]>
To: [log in to unmask]
Sent: Tuesday, 25 March, 2014 5:03:16 AM
Subject: Re: [SHOE] Circular flow

Remember: Irving Fisher constructed actual physical models with piping,
reservoirs, valves, and flows of water depicting economic relations and
magnitudes...a true circular flow.
David Hammes


On Mon, Mar 24, 2014 at 10:35 AM, Thomas Humphrey <[log in to unmask]>wrote:

> Don Patinkin exhaustively discusses this matter in his December 1973
> American Economic Review article entitled "In Search of the "Wheel of
> Wealth": On the Origins of Frank Knight's Circular-Flow Diagram", pages
> 1037-46.
> After depicting and describing the circular flow diagrams of Simon Newcomb
> (1886), Fleeming Jenkin (1887), Knut Wicksell (1901), Chiam Dov Hurewitz
> (1900), Francesco Ferrara (1864), Hector Denis (1904), Foster and Catchings
> (1923), M. C. Rorty (1922) -- diagrams that Patinkin judges deficient for
> one reason or another -- he ultimately awards the prize to Nicholas A. L.
> J. Johannsen (1908) who also published the diagram in 1903 under the
> pseudonym J.J. O. Lahn.
>
>
>
> On Mar 24, 2014, at 2:47 PM, [log in to unmask] wrote:
>
>  Colleagues:
>>
>>     What is the origin, or who first published the standard circular flow
>> diagram that appears in various forms in introductory texts?  Did it
>> precede or follow from the keeping of National Accounts in the first half
>> of the twentieth century?
>>
>>     Thanks to you who answered the question wrp "aggregate demand" and
>> "aggregate supply", terms that came into use with Keynesian macroeconomics.
>>
>> Robin Neill.
>>
>