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and a half. The length of the transverse pieces with thetenons is ten holes, their width one hole and a half, theirthickness ten holes. The length of the arm is sevenholes, its thickness at bottom three twelfths, and at tophalf a hole. The curve part eight holes. All these pro-portions are appropriate ; some, however, add to them,and some diminish them ; for if the capitals are higherthan the width, in which case they are called anatona, thearms are shortened: so that the tone being weakened bythe height of the capital, the shortness of the arm maymake the stroke more powerful. If the height of thecapital be less, in which case it is called catatonum, thearms must be longer, that they may be the more easilydrawn to, on account of the greater purchase ; for as alever four feet long raises a weight by the assistance offour men, if it be eight feet long, two men will raisethe weight \ in like manner arms that are longer aremore easily drawn to than those that are shorter.

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