rm an extra tight closure and noticed that the firebox is surrounded by a water cham- that all windows and doors must be closed—obviously ber from which two frusto-conical coils of tubing ex- a great annoyance to passengers in summer weather. tend upward. These tubes connect the water chamber Mr.… … flanges. Friction bands on this extension piece serve HEATER AND BOILER. IMPROVED GRAIN DOOR. to take up all wear from the friction of the flanges. As the smokestack passes along the flanges, the sec- prevent leakage of the grain. A door of this sort is several turns of tubing in each coil are laid…
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