This is a standard M27 mounted with a prototype boiler. This prototype boiler has an aluminium shroud, whereas the production models use brass.
The boiler is approx 29mm diameter x 51mm long. It is fitted with a Wilesco safety valve. It is heated by a tablet burner with the hot gasses passing through a single flue to the chimney. The firebox wraps round to enclose the boiler. Steam is fed through the burner flame, for a nominal superheat, to a rotary valve built into the main bearing. The cylinder is approx 7.5mm bore x 7.5mm stroke. It is a single acting fixed cylinder. The con rod is connected to a gudgeon pin inside the piston. The flywheel is 18mm diameter x 12mm thick. Engine and boiler are mounted on a brass base in an in-line configuration, similar to a marine engine, although there is no provision for driving a prop shaft. As acquired, the firebox was in dirty condition but the rest was in good clean condition. I have since cleaned up the firebox.| Make | Microcosm |
| Model | M27 & boiler |
| Made | 2016 |
| Description | stationary |
| Cylinders | 1 |
| Cylinder Type | single acting fixed |
| Piston Diam mm | 7.5 |
| Stroke mm | 7.5 |
| Valve Type | rotary |
| Boiler Type | Horizontal single flue |
| Fuel | Tablets |
| Mechanical Condition | good |
| Cosmetic Condition | Good |
| Paintwork | N/A |
| Packaging | |
| Purchased | 26/4/2016 |
| Purchase cost | £56 |
| Additional cost |