faco, a thin layer of straw or 

 shredded paper can be used to 

 mask it. By using a hose clamp, 

 with a long bolt projection, a trap 

 can be fitted to a pipe by drilling 

 a hole through the trail and fitting 

 it over the pi-ojecting bolt (fig. 8) . 

 Traps also may be nailed to verti- 

 cal walls where rats climb to holes 

 or runways (figs. 9 and 10). 



Figure 4. — Triggers of rat traps should be en- 

 larged with cardboard or hardware cloth. 



with the trigger forced between 

 the two layers of paper, will also 

 serve. If desirable, a smear of 

 bait can be rubbed on the surface. 

 Traps with the enlarged trigger 

 surfaces should be placed in such 

 manner as to force the rats to 

 cross over them, as by blocking a 

 runway behind a box or along a 

 beam or a ledge (figs. 5, 6, and 7) . 

 When the trap lies flat on a sur- 



•VNN 



Figure 



5. — Traps should 



naturally run. 



Rat hole 

 Figure 6. — Boxes or boards often may be placed so as to force rats to cross a trap trigger. 



11 



