The present invention related to a method and a device for reducing the number of water vapor molecules per unit volume in a housing by providing an end of the housing which has a lower thermal inertia than the rest of the housing with perforations. Within source code statements, the enforcement construct comprises an enforcement keyword that indicates an authorization restriction on the invocation of an object-oriented method in conjunction with an identifier of an authorization method. The variation prevention part includes a holding member configured to hold the endless belt member in the vicinity of the light illumination surface movably in the moving direction from the exterior surface side and the interior surface side of the endless belt member. An encoder identifies the location of the US probes 1330 and 1310 along the rail 10 and pairs the locations of the probes with the signals received.