Question for MR. KING: N&W Ashcroft Duplex Gauge

NW Mailing List nw-mailing-list at
Wed Mar 16 11:21:33 EDT 2016

Thank you for both the photograph and the solicitation of a full  
explanation of how it was used.  The educational opportunities like that  resulting 
from postings in these NWHS forums are most impressive and  valuable.
Dave Phelps
In a message dated 3/16/2016 10:00:44 A.M. Eastern Daylight Time,  
nw-mailing-list at writes:

Recently  I posted photographs of an N&W duplex Ashcroft steam gauge from 
an N&W  compound engine, asking for an interpretation. 

Mr. Al Phillips of  Chattanooga has furnished the answer. He is a retired 
marine boiler engineer  who now volunteers at the Tennessee Valley Railroad 
Museum and has  participated in the boiler work for restorations of Engines 
4449, 765, 610,  630 and others. 

Here is Mr. Phillips' interpretation of the gauge:  

"The black hand shows steam chest pressure to the high pressure (rear)  
cylinders, and its indication would be utilised by the engineer the same as it  
would be on a conventional two-cylinder engine. The red hand shows receiver 
 pressure (High Pressure exhaust = Low Pressure inlet,) and the engineer 
could  alter his cutoff accordingly. It would also show L.P. inlet pressure 
when the  engine is 'simpled' while exerting the maximum starting tractive 

With this explanation, the utility of the gauge becomes transparent.  Thank 
you, Mr. Phillips! 

-- abram burnett  

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