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OF PAPER Form factor is significant in the study of transformer losses; as is well known, hysteresis loss is small when the form factor is large, and vice versa. Every wave shape has a definite value of form factor; but the converse is not true, for a particular value of form factor does not indicate a particular wave shape. A wave may contain a third harmonic equal to seventy five per cent of the fundamental and still have the same form factor as a true sine wave. Form factor, therefore, hasdoi:10.1109/t-aiee.1915.4765247 fatcat:ynvy74kmjfgaxerhumxfyeo5xu