Abstract: We are developing a rocket-borne, imaging, wide-field, survey experiment to study global interactions in the multiphase interstellar medium. The experiment will map diffuse C IV (C$+3$PLU$/) $lambda@1549, H$-2$/ $lambda$lambda 1575 - 1645 Lyman band fluorescence, and dust-scattered starlight continuum ($lambda$lambda1400 - 1900) emission over one quarter of the sky in a single rocket flight. Good imaging is maintained in two dimensions, permitting the direct exclusion of stars entering the field of view. The payload consists of four independent, co- aligned telescopes of identical optical construction. Three telescopes are made sensitive in a narrow band by depositing tuned all-dielectric multilayers on the mirror surfaces to achieve a so-called `self-filtering' camera. Each telescope incorporates a large-format imaging microchannel plate detector that is read out using a two-dimensional, crossed, serpentine delay line anode which we have developed. The rocket flight, scheduled for launch in 1994, will be the first flight of a two- dimensional, crossed, serpentine delay line anode.!11
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