“Before I put a sketch on paper, the whole idea is worked out mentally. In my mind, I change the construction, make improvements and even operate the device. Without ever having drawn a sketch, I can give the measurements of all parts to workmen, and when completed, these parts will fit, just as certainly as though I had made accurate drawings. It is immaterial to me whether I run my machine in my mind or test it in my shop”…”The inventions I have conceived in this way have always worked”... “Whatever device I imagined I would construct and put into operation in my mind”.
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