Abstract
This adress contains following three articles,
1, This paper presents enthusiastically the importancee of the thermiio Lat relay in use of electric-kotats, elec.-futon etc., as the heat conservatoire and shows the important points of its construction and test results of some improved types.
2. The author measured the inner temperature of elec.-iron and denoted the inclination of further development in near future.
3. Then he explained fully what is the efficiency of elec.-iron and this technical meaning, expressing his desire to determine the standard specification of efficiency.
