Abstract: An electronic device may include a first bias lens that transmits world light to an output coupler on a waveguide. The output coupler may transmit the world light while coupling image light out of the waveguide. A second bias lens may transmit the world light and the image light to an eye box. A tint layer may transmit the world light towards the output coupler. The tint layer may be planar and layered onto a planar surface of the first bias lens or another lens, may be separated from the first bias lens by an air gap, may be non-parallel relative to the waveguide, and/or may be curved and separated from the first bias lens and the waveguide by air gaps. When planar, the tint layer may be provided with spacers between substrates or between the tint layer and the waveguide to maximize parallelism.

Abstract: An apparatus for removing contaminants from air, including nitrogen oxides, carbon monoxide, carbon dioxide, and sulphur dioxide. In one of the chambers of a multi-chambered enclosure, polluted inlet air is exposed to one or more first light sources emitting light at wavelengths less than or equal to 242.3 nm to cause dissociation of contaminant molecules, creating ozone plus remaining atoms. The remaining atoms are largely filtered by activated charcoal filters having an appropriate thickness which is sized to achieve suitable dwell times, and which also serves as an oxygen rich medium permitting the ozone generated to undergo atomic rearrangement, whereby ozone molecules (O3) and atomic oxygen atoms (O) form oxygen molecules (O2). In another downstream chamber, the air flow is exposed to one or more second light sources emitting light at wavelengths greater than 242.3 nm but less than 280 nm, causing conversion of remaining ozone into oxygen molecules.

Abstract: An insulated conductor (20) for use in a communication cable which includes a filling material (30) includes a copper conductor (25) and a composite insulation system (27) comprising two concentric layers of insulation. An inner foam layer (28) of the insulation comprises a cellular plastic material (28) which includes a stabilizer system. An outer layer (29) of the insulation is referred to as a skin and comprises a stabilized solid plastic material. The stabilizer system in each of the cellular and solid layers includes a bifunctional portion that functions as an antioxidant and as a metal deactivator and that has a relatively high resistance to extraction. The level of the bifunctional portion of the stabilizer in the cellular material is substantially greater than that in the skin inasmuch as it has been found that the level of the stabilizer cellular layer contiguous to the copper wire determines the oxidation performance level of the composite insulation.

Abstract: A skill game card device providing an apparatus for a player to engage in a game of skill. The card game device includes a substantially flat supporting sheet. A first indicia is contained on the flat supporting sheet. The first indicia depicts a plurality of figures arranged in a selected relationship as viewed in a given plane. A first layer of removable opaque coating covers the first indicia to hide from view of a player the first indicia. The flat supporting sheet has a second indicia contained thereon. The second indicia depicts the relative position of the figures depicted in the first indicia as viewed in a plane other than the given plane of the first indicia. A second layer of removable opaque coating covers the second indicia to hide from view of a player the second indicia. Means cooperate with the second layer of removable opaque coating to distinguish areas of that second layer of removable opaque coating.