294 



TIMBER BRIDGES AND TRESTLES. 



CHAP. VII. 



9. Figures shown on the plans shall govern in preference to scale measurements; if any 

 discrepancies should arise or irregularities be discovered in the plans, the contractor shall call 

 on the engineer for instructions. These specifications and the plans are intended to co-operate, 

 and if any question arises as to the proper interpretation of the plans or specifications, it shall be 

 referred to the engineer for a ruling. 



t 



I Lag Screws 



6 long 



-4*10 



Detail of Joint " 



Detail of Hanger. 

 Ca5lIron-2-Req'cL 



Hotes forty Lag 3cre*^\ A 

 bent Plate R*i*M0' 

 Z-focl.. 



devef Washfr-Casf Iron. 

 12-Req'ct. 



^w<?/ ftr<r/^ <?/?/ of rod to Zcdamefer. 

 Length of upset 8". Thread &? 



FIG. ii. DETAILS OF HIGHWAY CROSSING. ILLINOIS CENTRAL RAILROAD. 



10. The contractor shall, when required by the engineer furnish a satisfactory watchman to 

 guard the work. 



11. On the completion of the work, all refuse material and rubbish that may have accumu- 

 lated on top or under and near the trestle, by reason of its construction, shall be removed by the 

 contractor. 



