In this experiment, silver atoms were accelerated through an inhomogeneous magnetic field, generating discrete spots on the detector.
Sleator et al performed an optical version of this experiment in which resonant and non-resonant helium atoms appeared to behave differently; that optical variant can be used to make non-demolition measurements. This experiment was assisted by the sulfurous output of a cheap cigar turning a photographic plate black. Although this experiment appeared to confirm the Bohr-Sommerfeld (*) hypothesis over Larmor's theory, both were later shown to be incorrect.  The experimenters never considered the atoms they used were in the L=0 versus the L=1 angular momentum states. In this experiment, silver atoms were accelerated through an inhomogeneous magnetic field, generating discrete spots on the detector. For 10 points, name this experiment which showed that nuclei have quantized spin.
Sleator et al performed an optical version of this experiment in which resonant and non-resonant helium atoms appeared to behave differently; that optical variant can be used to make non-demolition measurements.
Stern-Gerlach experiment