Studies in magnetic testing

¿Introduction¿Magnetic units¿Effect of continued reversals of the magnetic force¿Apparent induction and permeability¿Demagnetisation by reversals¿Normal induction and permeability¿The critical magnetic force¿Apparent and normal intensity of magnetisation¿Magnetic history¿Method of demagnetisation¿Determination of the normal induction and permeability¿Transformer iron used in the experiments¿The magnetic square¿Tests of the magnetic square¿Preliminary magnetometric experiments¿Preliminary ballistic experiments¿Effects of many reversals of a force X upon the apparent permeability of a smaller force H¿Influence of many reversals of a force X upon the after-effects of a force Y¿Influence of partial demagnetisation on the after-effects of a large force¿Effect of a constant force X on the apparent permeability for a force H¿Experiments on virgin iron¿Magnetometric study of the action of effective demagnetisation on virgin iron¿Ballistic study of the action of effective demagnetisation on virgin iron¿Experiments on virgin, demagnetised and magnetised iron¿Rowland´s experiments¿Influence of partial demagnetisation on the permeability of virgin iron¿Constancy of the specimens¿The preparation of specimens¿Want of uniformity of specimens¿Conclusion.