The phrase "acted as magistrate" is correct and usable in written English.
It can be used in contexts where someone is performing the duties or functions of a magistrate, often in a legal or formal setting.
Example: "During the trial, the judge allowed the senior attorney to act as magistrate in order to expedite the proceedings."
Alternatives: "served as magistrate" or "functioned as magistrate".
The Song justice system was maintained by policing sheriffs, investigators, official coroners, and exam-drafted officials who acted as magistrates.
He acted as Senior Magistrate for Selangor and Negri Sambilan from May, 1904, to the end of the following year, and in July, 1906, was given the position which he now occupies.
(The censors were twin magistrates who acted as census takers, assessors, and inspectors of morals and conduct).
He was transferred to Negri Sambilan as District Officer, Coast, in 1899, and on his return to Pahang he acted as Secretary to the Resident, Senior Magistrate, Warden of Mines, and Protector of Chinese.
While it has been clear since 2008 that the Tinners acted as American spies, the announcement by the Swiss magistrate on Thursday, recommending their prosecution for nuclear smuggling, is a turning point in the investigation.
Insistent that theory should not be divorced from practice, she became a magistrate, served on five wages councils, acted as an industrial tribunal chairman and worked for numerous public bodies.
He acted as Frederick's representative in several north Italian cities, serving as podestà (chief magistrate) of Reggio in 1246 and at Cremona in 1249 and after 1249 as imperial vicar over the area from Pavia to Tuscany.
8 The ten generals were the most important Athenian magistrates of this period, and Pericles, elected every year as one of the ten, acted as their president.
In the first act, the player acts as the Confederate magistrate of an outlying colony world of Mar Sara, threatened by both the Zerg and the Protoss, and is forced through events to join the rebel Sons of Korhal under its leader Arcturus Mengsk.
Judge Rakoff proposes two reforms: scrapping mandatory-minimum sentences and reducing the prosecutor's role in plea-bargaining for instance by bringing in a magistrate judge to act as a broker.
In addition to the presiding magistrate, several additional magistrates were often present to act as assistants.
