Oven Thermometers.
Many efforts have been made to produce a thermometer which will indicate the temperature of the oven, but, so far as I know, none made with mercury have been satisfactory. There is made in this country, however, an “oven clock,” which can be set into the door of the oven. This is based on the principle of the contraction and expansion of the metals. To get the greatest benefit from these clocks the housekeeper must make her tests herself; that is, she must learn that when the hand points to a certain number the oven is right for roasting; when at another point, that the heat is right for baking bread, cake, etc. After she has established these facts, she may write out a table which will serve as a safe guide in the future.