Take any quadrilateral such as ABCD above. Construct the midpoints of each side and join them to form another quadrilateral EFGH. Varignon's Theorem asserts that the ...
WHAT is the force of the word “rigid,” introduced into the statement and proof of the parallelogram of forces and other theorems in Statics, as quoted by Mr. W. E. Johnson from the ordinary text-books ...
I HAVE read with much interest the new proof given by Mr. W. E. Johnson of “ the parallelogram of forces,” in NATURE of December 19 (p. 153), and regard it as deserving a place among the best proofs ...
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