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Bowman M101 stationary engine


This used to be the most impressive engine in my collection; both in size and performance. (It has been ousted in this honour in shear size by a couple of engines.) It has a metal base but there is also a wood base version designated E101

The brass boiler is a massive 6" long by 3" diameter with a water capacity of about a pint at the overflow plug. The traditional single acting oscillating cylinder is 3/8" dia. x 1" stroke. The cylinder is totally enclosed by a fixed brass cover which makes it look much bigger (over 1" dia. x 2 1/4" long). The slotted piston is lubricated by a drip feed lubricator mounted over the end of the cylinder. Attached to the crank shaft is a heavy brass flywheel, 2 3/4" dia. x 3/4", and a 12 tooth gear wheel, approx 1/2" dia. This engages an 84 tooth gear wheel nearly 3" dia. on the second shaft. Both shafts carry pulleys of about 1/2" dia. and the end of the second shaft is turned down to 5/32" dia. to fit standard Meccano parts.

The un-superheated feed from the boiler is taken via an in-line throttle to the cylinder and the exhaust is fed to the bottom of a 9" high chimney. The meths burner is a typical Bowman style but extra large with a brass tank 3" dia. by 1 1/4" high (holding 1/6 pint of meths!). Sticking out from this tank is a brass tube 4 1/2" long x 5/16" diameter, slotted along its length and containing the wick. When lit, the flame extends along the full length of the slot, which is almost the full length of the boiler.

The steel base plate is 9" by 11" and has a single row of Meccano standard holes, 5/32" dia. and 1/2" spacing, around all 4 edges.

The original price for this engine was 1/17/6 (1.875) about 80 years ago. It's probably now worth about a hundred times that. The lubricator and exhaust steam pipe were missing and the meths burner was mangled when I purchased it. I have since restored these but done little else. The paintwork may well be original. The maker's label is, unfortunately, illegible.

Make Model Made Description Cylinders Cylinder Type
Bowman M101 1928-35 Stationary 1 Single acting
Piston Diameter mm Stroke mm Valve Type Boiler Type Fuel Mechanical Condition
9.5 25.4 Oscillating Cylinder Horizontal Meths Good
Cosmetic Condition Paintwork Packaging Purchased Purchase cost Additional cost
Fair Original?
12/4/02 100.00 15.00