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Steam Boiler: Small Brass Shell Boiler, Screwed and Soldered (Hopkins, Model Engines and Small Boats, 1898)
Nevil Monroe Hopkins · Public domain (published 1898)
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3. noviembre 2026SE
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Steam Boiler: Small Brass Shell Boiler, Screwed and Soldered (Hopkins, Model Engines and Small Boats, 1898)

A small steam boiler for model engines and boats: a brass cylinder 4 in across, closed by two brass heads tied together by a brass stay rod, its seam held by two rows of brass screws and sealed with solder. It sits in a russia-iron jacket over an alcohol lamp, with a weighted safety valve and fusible plugs that put the lamp out if the water runs low. Result: a strong little shell boiler, 6 to 12 in long to suit the engine. Source: N. M. Hopkins, Model Engines and Small Boats (1898), ch. III. Unknown: the working pressure and the valve's sizes. Picture: the book's Fig. 33.
Intermedio
Unknown

Instrucciones

1

Make the heads and stay

Cut two brass disks 4 in across and about 1/8 in thick, each with a 1/4 in hole in the centre, and true them up in the lathe. Pass a 1/4 in brass rod through both and solder it, with plenty of solder inside the heads to make them steam-tight. Screw heavy brass disks (round nuts are better than square) onto the rod ends against the heads. Set the heads 10 in apart over their outsides; about 6 in will do for a small single-acting engine, 7 in for a double engine, up to 12 in for a larger one.

Materiales para este paso:

Barra redonda de latónBarra redonda de latón1 two heads, two nuts
Barra de latónBarra de latón1 1/4 in stay
Estaño-plomo de soldaduraEstaño-plomo de soldadura1 as needed
FundenteFundente1 as needed

Herramientas necesarias:

Torno de metalTorno de metal
Mechero BunsenMechero Bunsen
2

Roll and screw the shell

Cut soft sheet brass at least 1/32 in thick (1/16 in for boilers over 8 in long), about 14 in long and 1/2 in longer than the heads so it overhangs 1/4 in each end. Roll it round the heads on tinner's rollers, never by hand, so it laps about 1 in. Slip it over the heads and rod and bind it tight with heavy twine. Drill two rows of holes along the lap, tap them and turn in little brass screws that go just through the under plate without projecting. Do not use iron screws: their rust pits the seams.

Materiales para este paso:

Lámina de latónLámina de latón1 shell
Tornillos de máquinaTornillos de máquina1 small brass screws
Bramante de atarBramante de atar1 binding

Herramientas necesarias:

Cilindradora de chapaCilindradora de chapa
Taladro de manoTaladro de mano
Juego de machos y terrajasJuego de machos y terrajas
3

Solder it up

Push the heads and rod out, hold the shell in a Bunsen flame and run solder well along the seam. Push the heads back and solder them all round the edge, and screw the nuts tight: the screws and stay take the strain, the solder keeps in the steam. Drill two or three 1/4 in holes in the top and bush them with heavy brass disks soldered on. For fusible plugs, drill two 1/4 in holes near the bottom and solder them shut with little brass caps.

Materiales para este paso:

Estaño-plomo de soldaduraEstaño-plomo de soldadura1 as needed
FundenteFundente1 as needed
Barra redonda de latónBarra redonda de latón1 bushes and plug caps

Herramientas necesarias:

Mechero BunsenMechero Bunsen
Taladro de manoTaladro de mano
4

Fit the jacket and safety valve

Cut end supports from russia sheet iron to hold the boiler by its ends, with an opening for the alcohol lamp, and bend a russia-iron cover over it, riveted to the ends by little ears. Punch a row of small holes along the cover's lower edge to let air in for the lamp; the cover keeps in the heat and keeps draughts off the flame. Turn a small safety valve true in the lathe, grind it to its seat with emery and oil, and fit a lead weight on its bar. Not given: the valve's sizes.

Materiales para este paso:

Chapa de hierro rusoChapa de hierro ruso1 ends and cover
Remaches de hierroRemaches de hierro1 small
Barra redonda de latónBarra redonda de latón1 valve
PlomoPlomo1 weight

Herramientas necesarias:

Tijeras de chapaTijeras de chapa
Juego de remacharJuego de remachar
Torno de metalTorno de metal
Tela de esmerilTela de esmeril
5

Fire and set it

Fill the boiler two-thirds full, connect the engine and light the alcohol lamp under it. If the valve blows off before the engine turns over, move the weight a little farther out until the engine runs without steam escaping; well made, the valve will then blow off soon after the engine stops if the fire is left. If the water ever runs very low, the fusible plugs melt and the steam puts out the lamp. Do not try to burst a boiler to test it.

Herramientas necesarias:

Mechero de alcohol (lámpara de espíritu)Mechero de alcohol (lámpara de espíritu)

Materiales

10

Herramientas requeridas

9

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Herrero

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