2 Miscellaneous Circular 60, U. S. Dept. of Agriculture 



2 pieces of No. 3 1 (%-inch) oil-tempered spring-steel wire, each S feet long, 

 for making the two coil springs (6). 



1 piece of No. 6 ' oil-tempered spring-steel wire. 2 feet Long for tri 



spring (8). 



2 pieces of No. 6 oil-tempered spring-steel wire, each lo inches Long, for tri 



bars (11). 

 1 piece of 1-inch mesh, No. n; ' woven wire, galvanized before weaving 



inches Long from a roll 60 inches wide, for bottom and sides of trap (2.5). 

 50 feel of No. l-V galvanized malleable wire, for lacing and Linking wire mesh 



sides and floor of nap to jaws and bottom, for making trigger wires 



trigger collar (10), and safety hooks (16), and for fastening 



spring. 

 30 inches of No. 12 galvanized wire, for trigger (7). 

 5 quarter-inch holts, four of them % inch Long and one 1 inch Long, for 



attaching cross bars to base bar. 

 1 pair of 1%-inch brass hinges with strap-shaped sides, and fcwu screw holes 



in each, for trigger Loop (12). 







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» J B2936M 



Pig. 2.— Details of 



construction of Biological 



Survey 



braver trap 



1. Base bar. 



2. Cross bar. 



3. Top cross bar. 



4. Sbort cross bar. 



5. Trap jaw. 



6. Coil spring. 



7. Trigger. 



8. Trigger spring. 



9. Trigger wire. 



10. Trigger collar. 



11. Trigger bar. 



12. Hinged trigger loop. 





13. 

 14. 

 15. 



16. 



Trigger grip. 



Clasping hook. 

 Wire mesh. 

 Safety hook. 



SHOP WORK 



Drill T Vinch holes as follows: Two side by side. 3 inches from 

 each end of base bar; and one *4 inch from each end of long cross bar. 



Drill 14 -inch holes as follows: One in center and one at 13 inches 

 from each end of base bar; one in center and one 6 inches each side 

 of center of main cross bar: one in center and one y 2 inch from each 

 end of 13-inch cross bar; and one in center and one 14 inch from each 

 end of each 11-inch cross bar. 



Drill ^-inch holes as follows: At 3-inch intervals along flat jaws. 

 y 8 inch from outer edge and to about 4 inches of the ends: one in 

 middle of one trap-jaw bar 8 inches to right of center and one in 

 the other 8 inches to left of center of trap: two in middle of main 

 cross bar at 8 and 9 inches from each end. for hinges for trigger loops. 



AU wire sizes are standard American gaugi 



