A. W. STEVENS

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Ernest H. Casson
A. W. Stevens & Son Engine No. 1774 owned by Mr. Ira A. Prickett, Mt. Pleasant, Iowa. Courtesy of Ernest H. Casson, 909 Naperville Road, Wheaton, Illinois 60187.

909 Naperville Road, Wheaton, Illinois 60187.

The picture is a 9 H. P., A. W. Stevens & Son engine No.
1774, built in 1890 at Auburn, N. Y., and owned by Mr. Ira. A.
Prickett, 800 E. Washington St., Mt. Pleasant, Iowa, and shown
there by Mr. Prickett in 1970 with his grand-daughter, Sandra
DeVol, on the engine.

The boiler is a locomotive dry bottom firebox type. The shell is
24′ diameter, 86′ long, with lap joint seam, 33-2′
tubes 54′ long, firebox 21′ wide, 29′ long, 27′
grate to crown sheet. It is designed for 125 lbs. steam pressure
and operated at 120 lbs. The heating surface is 102 Sq. Ft. Grate
surface 4.23 Sq. Ft., firebox volume 9.5 Cu. Ft. When burning 85
lbs. of 11,500 Btu. lb. of coal per hour, at 72% boiler efficiency
and steam at 120 lbs. pressure, feed water temperature 60°F., the
boiler will produce 600 lbs. of steam per hour.

The engine is a single cylinder, 6′ bore, 9′ stroke,
‘D’ type slide valve with Arnold valve gear, reversing and
cutoff adjustment. Belt work governed speed 250 RPM. on traction
240 RPM. At 240 RPM. and one-half stroke cutoff the engine will
develop 21.2 indicated horsepower. At 75.4% engine mechanical
efficiency the brake horsepower is 16.

The engine traction system is a two shoe band or flywheel
clutch, a 16 tooth crankshaft pinion, an 84 tooth intermediate
gear, 1 57 tooth differential spur gear, 16 tooth bull pinions, 62
tooth bull gears and 54′ Dia. drive wheels with 11′ rims.
The engine is estimated to weigh 10,500 lbs. with fuel and water
supply. The ratio of engine RPM. to drive wheel RPM., is 13.8 to 1.
The road traction speed at 240 RPM. Engine speed is 2.75 MPH. The
horsepower delivered to the drive wheel rims is 9. When the engine
is traveling on a light clay loam stubble field at 2.75 MPH. it
requires 525 lbs. tractive effort equal to 3.91 H. P. The net
tractive effort at the drawbar is then 683 lbs. equal to 5.09 H. P.
The engine is well kept by Mr. Prickett, who also operates other
engines.

Engine construction and operating features by courtesy of Mr.
Prickett. Performance calculations and submitted by Ernest H.
Casson, Wheaton, Ill.

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