334 The Sweet Potato 



" No. 2. This grade shall consist of sound sweet pota- 

 toes of similar varietal characteristics not meeting all 

 the requirements of grade No. 1 which are free from 

 serious damage caused by dirt or other foreign matter, 

 frost-injury, heat decay, bruises, cuts, scars, dry rot or 

 other diseases, insects (including weevils) or mechanical 

 means. The diameter shall not be less than one and 

 one-half inches. 



" Five percentum by weight of any lot may be less 

 than the diameter prescribed, and in addition, five per- 

 centum by weight of such lot may be below the remain- 

 ing requirements of this grade. 



" ' Sweet Potatoes ' include yams. 



" ' Pimctically free ' means that the appearance shall 

 not be injured to an extent readily apparent upon casual 

 examination of the lot and that any damage from the 

 causes mentioned can be removed by the ordinary 

 processes of paring without appreciable increase in 

 waste over that which would occur if the sweet potatoes 

 were perfect. 



" ' Diameter ' means the greatest dimension at right 

 angles to any portion of a central line running through 

 the sweet potato from stem end to root end. 



" ' Free from serious damage ' means that the appear- 

 ance shall not be injured to the extent of more than 20 

 percentum of the surface, and that any damage from 

 the causes mentioned can be removed by the ordinary 

 process of paring without increase in waste of more than 

 ten percentum by weight over that which would occur if 

 the sweet potato were perfect." 



A number of attempts have been made to design a 

 practical sweet potato grader, but thus far all efforts 



