Translation of "Die Messung quantenmechanischer Operatoren" by E. Wigner (Z. Phys. 133, 101-108, 1952)

This is a facsimile-style translation of Wigner’s seminal paper on measurement limitations in the presence of additive conservation laws. A critical survey of the history of subsequent extensions and variations of what is now known as the Wigner-Araki-Yanase (WAY) Theorem is provided in a paper published concurrently.