Abstract: A polarized film apparatus comprising printed bands of successively alternating polarization orientations is disclosed. The printed bands of alternating polarization orientations repeat throughout the length of the film. The polarized film can be installed in an object, for example a window where the amount of energy through the object has to be controlled. Two identical films are superimposed to create polarization patterns that can be varied when one film is displaced with respect to the other. The resulting variable polarization patterns can be utilized to control the amount of energy allowed through this arrangement. The polarized films with bands of alternating polarization orientations can be utilized to control the amount of energy for example sunlight, radiated heat transmission, illumination level, electromagnetic radiation, etc.

Abstract: A apparatus with an adjustable height mattress can include a crib frame with a stationary support frame secured to it. The mattress rests generally on an elevator frame which slides up and down with respect to the stationary frame. The crib further includes a height adjusting mechanism for adjusting height of the elevator frame, an operating mechanism for operating and locking the height adjusting mechanism and a leveling mechanism for maintaining the level of elevator frame horizontally stable. The mattress height can be adjusted not only on a semi-permanent basis, but can also be varied as needed. The mattress can be set high when a parent is placing a child in the crib and can be lowered with the child on it for the child's safety. The elevator frame may also be manually raised with the child on it via an external handle.