RESISTANT VINEYARDS GRAFTING, PLANTING, CULTIVATION. 103 



greatest accuracy, therefore, is obtained where it is least needed, viz., 

 in the larger sizes. 



To overcome this objection and also to facilitate the work of sorting, 

 the slot grader shown at the bottom of Fig. 4 was devised at the 

 Experiment Station. This grader consists of a brass plate in which 



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FIG. 4. GRADERS. 



Notch Grader, above. Each notch is of the width indicated by the corresponding number, 

 which represents sixteenths of an inch. 

 Slot Grader, below. Width of slot at e, % inch; at a, j inch. Length of slot from e to a, 7 inches. 



is cut a tapering slot terminated at each end by circular enlargements* 

 Fig. 4 shows the exact dimensions and Fig. 5 the general appearance 

 of the grader. The brass plate is screwed on to a wooden block in 

 which is cut a groove three fourths of an inch deep and corresponding 

 to the slot in the plate. The cuttings are graded by inserting the end 



FIG. 5. Slot grader mounted on a wooden block. 



which is to be grafted in the wide end of the slot and then passing it 

 along the slot until it can go no farther. Cuttings over one half of an 

 inch in diameter will not enter the slot, while those under one fourth of 

 an inch will pass completely through. Cuttings of dimensions between 

 these two extremes will stop the nearer the large end of the slot the 

 thicker they are. In order to grade them into various sizes, therefore, 

 all that is necessary is to mark lines on the brass plate, or, better, on 



