Applying a differential equation
dθ/
dt=-γ(θ-
T),
where Θ denotes the temperature of room, air
t time,
T open-air _??_emperature, function of
t, γ inhe_??_ent constant of room, the author calculated γ of rooms of three different houses at Ootomari in cases when
T was nearly constant all night long, viz. independent of
t, at cold season, with a view to investigate spontaneous cooling of room.
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