A fireless cooker
The principles of the fireless cooker are based on a knowledge of the laws governing the conduction and radiation of heat. For this reason, an elementary science lesson relating to these laws should precede this lesson. Such a science lesson is part of the regular grade work of Form IV, so if a specialist teaches the Household Management of that grade, she and the regular teacher should arrange to co-ordinate their lessons.
PRINCIPLES OF THE FIRELESS COOKER
1. It furnishes no heat, but conserves the heat which is in the food when it is put into the cooker.
2. It conserves the heat in the food, by surrounding it with substances which are poor conductors of heat.
3. Extra heat may be given the food, after it is put in the cooker, by placing heated stone plates above and below the dish that contains the food. The stone used for this purpose must be a good absorbent of heat.
REASONS FOR THE USE OF THE FIRELESS COOKER
1. It saves fuel and is therefore economical.
2. It saves time, because it requires no watching.