Mechanical forces in transformers

W. S. Moody: The problem of taking care of mechanical forces in transformers became a really difficult one for the practical designing engineer some fifteen or twenty years ago. Previous to that, the power available in case of a short circuit and the size of transformers were not sufficient to require much more than good judgment on the part of the engineer to provide the necessary mechanical support. But with the increase in size, and more particularly with the increase in the available power, the necessity of accurate calculation of these forces arose. Ever since, therefore, we have welcomed most cordially the assistance of the ablest mathematicians and physicists who have shown interest in this difficult problem.