July 26, 1889
Clause (h) of section 2 of General Rule III is hereby amended by adding to that clause, at the end thereof, the following: "or for temporary appointment for not exceeding thirty days in any part of the classified service."
Approved:
BENJ. HARRISON
Benjamin Harrison, Executive Order—Amendment of Civil Service Rules Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/205885