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A very different matter. Here you must model your figure in wax, and make moulds of the parts of it, and chisel each part separately, copying the model. And then you must join all the parts together with silver-soldering, and go over the lines carefully.
When all necessary holes have been made and are of the correct size, begin by riveting and silver-soldering in the ends of the drums. Next fix the cross tubes, E, taking care that they and B and C form rectangles.
Silver-soldering requires the use of a powerful blow lamp or gas-jet; ordinary soft soldering bits and temperatures are ineffective. Brazing is better still, but should be done by an expert, who may be relied on not to burn the metal. Getting the prepared parts of a boiler silver-soldered or brazed together is inexpensive, and is worth the money asked. Some Points in Design.
The tapered end is passed first through the larger hole and driven home in the other, but not so violently as to distort the flue. If the tubes are made fast in this way, the subsequent silver-soldering will be all the easier. The Steam Dome. The large holes 2 inches in diameter required for the steam dome render it necessary to strengthen the barrel at this point.
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