Plate envelope
National Research Council Canada
This small cardboard envelope is designed to hold the photographic plates used in the spectrograph. The outside has details about the star observed and the observation.
Science, National and Civic Identity, and Tourism at the Dominion Astrophysical Observatory, Victoria B.C. Science, National and Civic Identity, and Tourism at the Dominion Astrophysical Observatory, Victoria, BC Friends of the Dominion Astrophysical Observatory