¶ Copper Sequence
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five years between invention and actual use because you had to be careful about those lives. There is a 10-year lag in the automobile improvement; and there is a 15-year lag between the invention in the railroading art; 25 years in big buildings; and 50 years in small houses.
So then I too kthe inventory of the metals, of copper in each of these categories. The building industry, and so forth. This whole thing averaged at every 22 years-- every 22\frac12 years-- the total metals really came out of the last generation of design and went into the new design.
In the electronic world you are dealing with invisible reality. That’s why we have electronics. So at any rate there were those different categories. I find nobody realizes the gestation rates of that kind of art. Taking the inventory of the coppers I found that 22\frac12 years would be when it would come out. And I say the whole copper industry was completely bewildered by the scrappers showing up. So here in 1917 we got this fantastic new production. I went back to 1917 because in 1936 that was 19 years back. I Took my 22\frac12 years and found, sure enough, the
