Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 194
This prmciple is known as the second law of motion,and is also known as the parallelogram of forces. In these investigations no account has been taken ofthe weight or mass of the body moved. It was cleajrlyperceived that the force exerted by a body at rest press-ing upon any support was precisely…
Astronomy
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