Phipps and Taylor performed a critical test of this experiment in 1927 using hydrogen, and they confirmed its results. The sulfur in one of its namesake's cheap cigars accidentally turned the trace of this experiment's (*) atom beam jet black, inspiring the use of a photographic development process. The beam was first passed through a non-homogeneous magnetic field, resulting in the deflection of the atoms into two beams based upon the spin of an unpaired outer shell electron. For 10 points, name this 1920 experiment that demonstrated the spatial quantization of the spin moment of momentum of 
Phipps and Taylor performed a critical test of this experiment in 1927 using hydrogen, and they confirmed its results. The sulfur in one of its namesake's cheap cigars accidentally turned the trace of this experiment's (*) atom beam jet black, inspiring the use of a photographic development process. The beam was first passed through a non-homogeneous magnetic field, resulting in the deflection of the atoms into two beams based upon the spin of an unpaired outer shell electron. For 10 points, name this 1920 experiment that demonstrated the spatial quantization of the spin moment of momentum of electrons by deflecting silver atoms through a magnetic field.
Phipps and Taylor performed a critical test of this experiment in 1927 using hydrogen, and they confirmed its results.
{Stern-Gerlach} experiment (3) [BH]