Abstract
The author theoretically deduced a differential equation for the cooling of room-air,
where θ denotes the temperature of room-air, t the time, T the temperature of the free air outside of the room, v the wind velocity, α, β, δ, _??_, σ constants depending on the st_??_ucture and materials of building. On the other hand, the author observed the temperature of room-air by a recording thermometer at three different places in the office-room of Ootomari Meteorological Observatory in the cold season of 1937-1938, and confirmed that these results coincide with the above theory to a certain extent.
