If one oven in the school kitchen can be equipped with a chemical thermometer inserted in the oven, the following experiments are helpful.
1. Let each pupil test the oven by feeling, when it has reached 380° F., 400° F., 425° F., 450° F., 475° F.-500o F.
2. Place pieces of white paper, one for each pupil, in the oven for five minutes at the various temperatures. These may be pasted in the notebook for future reference.