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1. �떆�뿕紐⑹쟻
�몺 媛곸쥌 怨듭뾽�옱猷뚯쓽 鍮꾩빱�뒪寃쎈룄媛믪쓣 痢≪젙�븳�떎.
�몼 媛곸쥌 怨듭뾽�옱猷뚯쓽 寃쎈룄��� 媛뺣룄����쓽 愿�怨꾨�� �씠�빐�떆�궓�떎.
�몾 媛곸쥌 湲덉냽�옱猷뚯쓽 媛�怨듭긽�깭, �뿴泥섎━ 諛� �몴硫댁쿂由� �긽�깭�쓽 �옱猷뚰듅�꽦�쓣 �룊媛��븯�뒗�뜲 �엳�떎.
2. 愿��젴�씠濡�
�몺 釉뚮━�꽟寃쎈룄�떆�뿕��� �븯以묒쓣 �씪�젙�븯寃� �븯硫� steel ball�씠 �옉�븘吏먯뿉 �뵲�씪 �넂寃� �릺怨�, steel ball�쓽 �겕湲곕�� �씪�젙�븯寃� �븯硫� �븯以묒쓽 利앷����� �븿猿� 諛섏궗�쟻�쑝濡� 利앷���븳�떎. �쓽 蹂��솕�뒗 媛�怨듦꼍�솕�뿉 愿��젴�맂 �쁽�긽�씠�떎. 留덉씠�뼱踰뺤튃(Meyer`s law)�뿉�꽌 �룞�씪 湲곗���뿉�꽌 寃쎈룄瑜� �뾼寃⑺븯寃� 鍮꾧탳�븯湲� �쐞�빐�꽌�뒗 �옄援���� �긽�궗�삎�씠�뼱�빞 �븳�떎. 洹몃윭�굹 釉뚮━�꽟寃쎈룄�쓽 寃쎌슦�뿉�뒗 �씠 議곌굔��� �뾼諛��븯寃� �떎�쁽�릺吏� �븡�뒗�떎. steel ball怨� �룞�씪�젙�룄�쓽 寃쎈룄�쓽 �옱猷뚯뿉 ����빐�꽌�뒗 �젙�솗�븳 痢≪젙�쓣 �븷 �닔 �뾾�떎�뒗 寃껋쓣 �쓽誘명븯硫�, �씠�윴 遺덈━�븯怨� 遺덊렪�븳 �젏�쓣 �젣嫄고븯湲� �쐞�븯�뿬 1925�뀈 R.L.Smith��� G.E.Sandland媛� 泥섏쓬�쑝濡� �젣�븞�븳 寃껋쓣 �쁺援��쓽 �븫�뒪�듃濡�(Vickers Armstrong Co.)�뿉�꽌 �떆�뿕湲곕�� �긽�뭹�솕�븯����떎.
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