The effective electronic orbital contribution M0 and the effective electronic spin contribution Ms to the spontaneous magnetization Mt for binary alloys of Fe, Co, and Ni are determined from Scott's measured magnetomechanical g'-factors using the relations M0Mt=(2-g')g' and MsMt=2(g'-1)g' where g' is assumed to be independent of the strength of the magnetic field and the temperature. It is believed that M0Mt has several-fold greater accuracy when determined from the g' factors than when determined from ferromagnetic-resonance g factors. In terms of the Bohr magneton μB, the orbital magnetic moments for the pure elements at 300°K are: for iron, (0.0918+/-0.0033)μB (4.22% of Mt); for cobalt, (0.1472+/-0.0034)μB (8.81% of Mt); and for nickel, (0.0508+/-0.0012)μB (8.92% of Mt). The Ms values for the fcc phases of the alloys agree well with those reported by Meyer and Asch from their g-factor data. For these alloys, M0 is much more sensitive to the crystalline structure than Ms and Mt are. The relationship g'-1+g-1=1 holds for Fe-Ni and Fe-Co alloys (with the exception of one point) within the accuracy of the g-factor measurements (~0.1-1.0%).