During his four - year tenure , Gilliss reduced the backlog of scientific work that had gone unpublished , encouraged the manufacture of American - made astronomical equipment .
During his four - year tenure , Gilliss worked closely with other American observatories .
During his four - year tenure , Gilliss reduced the backlog of scientific work that had gone unpublished , encouraged the manufacture of American - made astronomical equipment , and worked closely with other American observatories .