gth of magnets by oscillation appeared to me men, in the earlier progress of the improvement, are to take too much time. I therefore tried another ex- said to have looked upon the application as practi- pedient, which is so simple and yet serves its purpose that these vents or chokes, whether two… … rapid gyratory motion most evidently gives the mass obvious, if the rifled gun, simply by the force of of the projectile a vis viva that would require a con- the charge, can project a ball or shell, say four or five A No. 12 sewing needle is magnetized to saturation siderable disturbing force to…
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