Building a Portable Steam Engine by Tony Webster

Author:Tony Webster
Language: eng
Format: epub
ISBN: 9781847978660
Publisher: Crowood

Firebox door-plate with fire-hole and stays silver soldered in place.

Firebox door-plate silver soldered in place.

It is important that the pipe bringing pressure to the gauge is a ‘U’ shape, so capturing a little condensate in the ‘U’ and thus protecting the gauge from the heat of the steam. Use 1/16 in diameter copper tube and silver solder the nipple that came with the pressure gauge onto one end. Make sure that the nut goes on the right way round. The other end is silver soldered into a bronze plug that has a 3/16 in × 40 thread to match the bush at the top of the boiler door-plate. Leave the tube straight for this operation. After it is screwed into its bush, the tube can be bent down and round to the left to present a vertical connection to the ¾in diameter pressure gauge.

A feature of the original engine was a small plate on the door-plate to indicate the top of the firebox. Its position is critical. The height of the fire-box is measured, internally, down to the firebox skirt. To this distance is added ¼in and measured up the outside of the door-plate. Drill a hole, in the dummy door-plate only, and insert a short brass or copper rivet. Gently mark a line across with a chisel. It is essential that the water level remains above this mark. The added ¼ in is to allow for the thickness of the firebox wrapper plate and the minimum amount of water over the firebox.

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