Abstract: A system (M) for removably mounting a device (D) that is viewable by a user (U) to an essentially rigid headgear (H) includes a removable strap assembly (10) extending about the headgear (H). The strap assembly (10) includes a strap (18) with a first end (20) having a first securing means (24) to engage a first edge (26) of the head gear (H.) A second securing means (28) secures the strap (18) to a second edge (20). A mounting assembly (32) extends from the strap assembly (10) in proximity to a first end (14) of the strap assembly (10) for controllably positioning the device (D) in an ocular axis (34) of the user (U). The mounting assembly (32) controllably adjusts the device (D) along a forward and backward axis (A1), a vertical axis (A4), and a horizontal axis (A2) of the viewer (U).

Abstract: A photocathode manufacturing intermediary article (24) includes a substrate layer (26), and an active layer (20) that is carried by the substrate layer (26). The active layer (20) includes photoemissive alkali antimonide material that is epitaxially grown on the substrate (26).