Abstract :
Engineering, perhaps more than any other profession, has many precepts and fundamental principles upon which there can be no differences in opinion among the members of the profession. Nevertheless, there are certain phases of this field of science in which the opinions and specifications sponsored by different engineers, may be as widely diversified as the diagnoses of a particular medical case by several physicians. It is only natural to expect that such a condition may frequently be encountered in any line of endeavor inasmuch as the realm of man´s absolute knowledge is limited, consequently a thorough interchange of ideas on any problem upon which there is likely to be a diversity of opinion is nearly always advantageous to those concerned with its solution. As elsewhere, this is quite true in illuminating engineering as has been shown by the advances which have been made in this field during recent years.
