31419154cross-staffsPT2026-03-30 20:52:52UF31419161staffs, Jacob'sNDUF31419155Jacob's staffsNDUF31419156Jacob's stavesNDUF31419157cross-staffNDUF31419158cross-stavesNDUF31419159forestaffsNDUF31419160jacob's staffNDBT31398114vertical angle measuring devicesPTBT31383815astronomical instrumentsPT