134 



INSECTS INJURIOUS TO VEGETABLES 



for the protection of cabbage against the oviposition of the fly 



was perfected in 1889 by Mr. W. H. Goff. 



The cards are cut in hexagonal form (fig. 85), in order to 



economize material, and a thin grade of tarred paper is used, as 

 the cards made from it are more readily placed 

 about the plant without being torn. The blade 

 of the tool, which can be made by a blacksmith, 

 is formed from a band of steel, bent in the form 

 of a half hexagon, and then taking an acute 

 angle, reaches nearly to the center, as shown in 

 figure 86. The part making the star-shaped cut 

 is formed from a separate piece of steel, so 

 attached to the handle as to make a close joint 

 with the blade. The latter is beveled from the 

 outside all around, so that by removing the part 

 making the star-shaped cut the edge may be 

 ground on a grindstone. It is important that the 

 angles in the blade be perfect, and that its out- 

 line represent an exact half hexagon. 



To use the tool, place the tarred paper on the 



Fig. se'-Tool for e"d of a section of wood and first cut the lower 

 cutting cards. | jj^^.^ iiotches, as indicated in figure 87, using 



About one-fourth ^ ' o / o 



size.(AfterGoff.) only One angle of the tool. Commence at 

 the left side, and place the blade as indicated by the dotted lines, 

 and strike at the end of the handle with a light mallet, and a 

 complete card is made. Continue in this manner across the 



Fig. 87.— Showing how tool is used, dotted line indicating position 

 of edge of tool. (After Goff) 



