Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 290
the same particle m' of the first line and consider amount upon the next, and so developing the actions upon it of two particles n, n', reciprocal vertical actions equal to the ex- of the second line at equal distances above traneous force. and below it, it will be seen that m will Let us next seek… … section ab downward, the entire resultant the extraneous force in the process of of all the actions of the pairs of particles lateral transmission just considered. Let n, n, of the section cd, on m', will be ab and cd, Fig. 2, represent two vertical
Engineering
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