CONTENTS--Efficiency of model boilers—Evaporative power—Convection currents—Boiler design—Pot boilers—Water-tube boilers—Marine boilers—Riveting model boilers—Super-heaters.
Small boilers to drive model steam engines may be made according to several different designs. Some of these are more efficient than others from the standpoint of evaporative power and some are more adaptable than others for a specific purpose. As an example, a vertical pot boiler would not be as successful for use in a model speed boat as a flash boiler would be and yet, many times, the flash boiler could not be employed as conveniently as the pot boiler in certain work. The model maker should therefore choose the type of boiler that is most adaptable to the work for which he wishes to use it. This text will describe a few of the more common types of boilers together with information that will aid greatly in designing and constructing them.
