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1921 Stanley Steamer model 740B 20 hp steam car

Made 1921-1922
Automobile, full-size, steam car, 'Stanley Steamer', Model 740B, 20 hp, chassis No. 22367 made by Stanley Motor Carriage Co, Newton, Massachusetts, USA, 1921-1922, body No. 1277 made by Currier & Cameron, Amesbury, Massachusetts, United States of America, 1921-1922

In appearance this Stanley steam car is like other touring cars of the 1920s. It has a condenser (radiator), body, wheels, axles, chassis frame, steering gear, brakes, storage battery and dynamo. Only its power plant is different; it consists of a two-cylinder steam engine, a kerosene-fired water tube boiler and a control system derived from steam engineering practice.

The power plant consists of: a simple two-cylinder, double-acting steam engine suspended from the chassis and riding on the springs, but geared directly into the rear axle; a boiler which supplies steam to the engine; a burner which supplies heat to the boiler; a set of tanks and pumps which automatically supply water to the boiler, fuel to the burner and lubricating oil to the engine cylinders; a set of automatic valves which control the supply of water to the boiler and fuel to the burner; a condenser which condenses the exhaust steam and returns the water to the water tank; a storage battery which supplies current for lights, horn and for starting the pilot; and a dynamo which charges the storage battery.

The addition of a steam gauge in the engine bay was insisted upon by an Australian boiler inspector and was not usual.

The body of this Stanley steam car is a 7-seater, 4-door, open tourer which resembled its petrol-driven contemporaries in appearance. It was built by Currier & Cameron of Amesbury, Massachusetts, USA. The car features two face-forward occasional seats, black leather upholstery, steering wheel with timber trim, leather lining, and pockets on all but the driver's door, a tool kit pocket under a flap on the inside of the driver's door, rubber matting on the floor, black leatherette fold-up collapsible roof, and wire wheels with "Stanley" on the hubs. A brass mascot of a rampant eagle is mounted on the condenser (radiator) cap. The car has left-hand drive and a way-indicator on the passenger side. The Stanley steam car is finished in International Harvester green with black mudguards. The car is missing occasional seats (called jump seats in the US) in the back passenger area.

Stanley steam cars made for the Australian market had several features which distinguished them from those made for the US market. All Stanleys sent to Australia had wire wheels, while those in the US had wooden artillery wheels. Also, Australian dealers added "Stanley Steamer" in metal writing across the radiator.

Specifications
Serial No. 22367
Body No. 1277
Model 740B
H.P.: 20 horsepower
Bore: 102 mm
Stroke: 127 mm
No. of cylinders: 2
Treasury H.P. rating: 16.5 h.p.
Chassis Price: 1,100 pounds
Top gear ratio: 1.5 to 1
Wheels size: 34 x 4 and a half
Weight: 2 tons (approx).
Boiler pressure: 600 p.s.i.
Tubes and boiler originally tested to 1,800 p.s.i.
Air storage tank pressure: 120 p.s.i.
Safety valve set to blow at 750 p.s.i.
Boiler capacity: 23 gallons (104.5 litres)
Normal water level of boiler: 16 gallons (72.7 litres)
Amount of water carried: 20 gallons (90.9 litres)
Pressure in pilot fuel tank: 30 p.s.i.
Pressure in main fuel tank: 100 p.s.i.
Amount of fuel carried: 28 gallons (127.3 litres)
Original No. of fire tubes in boiler: 640
Modified No. of fire tubes in boiler: 248
Original outside diameter of fire tubes in boiler: 33/64 ths
Modified outside diameter of fire tubes in boiler: 0.7 inches (19 mm)
Diameter of boiler: 23 inches (584 mm).
Length of fire tubes: 18 inches (457 mm)
Speed of engine: 924 r.p.m.
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