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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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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.
Ophakathi
Unknown

Imiyalelo

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.

Izinto zokwakha zalesi sinyathelo:

Ubhamu Oluyindilinga Lwethusi EliphuziUbhamu Oluyindilinga Lwethusi Eliphuzi1 two heads, two nuts
Ubhamu LwethusiUbhamu Lwethusi1 1/4 in stay
I-solder ye-tin nomthofuI-solder ye-tin nomthofu1 as needed
IfulaksiIfulaksi1 as needed

Amathuluzi adingekayo:

Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Isibani se-BunsenIsibani se-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.

Izinto zokwakha zalesi sinyathelo:

Ishidi Lethusi EliphuziIshidi Lethusi Eliphuzi1 shell
Izikulufu zomshiniIzikulufu zomshini1 small brass screws
Intambo yokubophaIntambo yokubopha1 binding

Amathuluzi adingekayo:

Ama-roller okugoba ishidiAma-roller okugoba ishidi
Ibhola lesandlaIbhola lesandla
Isethi yokusika izikulufuIsethi yokusika izikulufu
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.

Izinto zokwakha zalesi sinyathelo:

I-solder ye-tin nomthofuI-solder ye-tin nomthofu1 as needed
IfulaksiIfulaksi1 as needed
Ubhamu Oluyindilinga Lwethusi EliphuziUbhamu Oluyindilinga Lwethusi Eliphuzi1 bushes and plug caps

Amathuluzi adingekayo:

Isibani se-BunsenIsibani se-Bunsen
Ibhola lesandlaIbhola lesandla
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.

Izinto zokwakha zalesi sinyathelo:

Ishidi lensimbi yaseRussiaIshidi lensimbi yaseRussia1 ends and cover
Izipikili zensimbiIzipikili zensimbi1 small
Ubhamu Oluyindilinga Lwethusi EliphuziUbhamu Oluyindilinga Lwethusi Eliphuzi1 valve
UmthofuUmthofu1 weight

Amathuluzi adingekayo:

Isikeli sensimbiIsikeli sensimbi
Isethi yama-rivetIsethi yama-rivet
Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Indwangu ye-emeryIndwangu ye-emery
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.

Amathuluzi adingekayo:

Isibani sikagologoIsibani sikagologo

Izinto

10

Amathuluzi Adingekayo

9

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