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The small water-tube is preferable to the small fire-tube connecting furnace and chimney, as its surface is exposed more directly to the flames; also it increases, instead of decreasing, the total volume of water in the boiler. A Vertical Boiler. The absence of a water jacket to the furnace is partly compensated by fitting six water-tubes in the bottom.
The boiler is entirely enclosed, except at one end, so that the hot gases get right round the barrel, and the effective heating surface has been more than doubled by fitting a number of water-tubes, aaa, bbbb, which lie right in the flames, and absorb much heat which would otherwise escape.
The 5/16 or 3/8 inch water-tubes must be annealed and filled with lead or resin before being bent round wooden templates. After bending, run the resin or lead out by heating. The outflow end of each pipe should project half an inch or so further through the boiler bottom than the inflow end.
The water-tubes are then inserted and silver-soldered, and one finishes by soft-soldering the boiler top to the barrel and fixing in the seatings for the water and steam gauges, safety-valve, mud-hole, filler, and pump-if the last is fitted. The furnace is lined with a strip of stout sheet iron, 7 inches wide and 19-1/4 inches long, bent round the barrel, which it overlaps for an inch and a half.
I have known a girl with a magnificent voice who endured great hardships for a musical education, and who finally accomplished her purpose and enchanted the world with her singing. She was happy. Of course everybody expected her to be. But I have known another girl, equally happy, carefully working in the laboratory to find the water-tubes of a star-fish or the nerves of a clam.
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