ABSTRACT
There is a very close relationship between physics and industry. The truth is that all forms of industry are nothing but various sections of physics or chemistry applied and exploited on a large scale. But it is also true that most conceptions of physics are discovered as the result of consideration of technical problems. The realm of technique is grate-
f~l enough to remember the origin of the methods employed by engineers, but the pure scientist usually forgets the manner in which any particular problem found its way into the primers of physics. He begins the history of any problem at the stage where it is already formulated as a scientific problem.
