Mention743749

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so:text What is needed is a homely experiment which could be carried out in the basement with parts from an old sewing machine and an Ingersoll watch, with an old file of Popular Mechanics standing by for reference! This I am, alas, afraid we have not achieved, but I do believe that the following example... is adequate to expose the principles... (en)
so:isPartOf https://en.wikiquote.org/wiki/Howard_P._Robertson
so:description Geometry as a Branch of Physics (1949) (en)
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