APPENDIX B. 3*7 



be notched 6 inches deep, but the ladder shall be set i inch back from the face of the 

 crib. The timber in the ladders wiU be estimated and paid for as "Timber in Perma- 

 nent Construction," and the iron under the classification of "Iron and Steel." 



50. Filling. The filling shall be of sound, hard, broken stone, in sizes ranging 

 from of a cubic foot to 5 cubic feet, but if the proportion of voids shall at any time 

 seem unnecessarily large to the Engineer the stone shall be arranged by hand. No 

 shaly or soft stone will be accepted. The open spaces between the face and end stringers 

 of all the cribs shall be carefully covered as the filling progresses, beginning at the pool 

 level, with flat stones of fairly uniform size, placed on edge and more than covering the 

 opening. The top surfaces of all cribs shall be paved with stones not less than 10 

 inches deep and from i to 2 square feet of surface, laid with fairly close joints, and with 

 tops flush with the top of the cribs, and with a reasonably smooth surface, all to the 

 satisfaction of the Engineer. 



Note. If the lock-gates are to be of wood the following specifications for them 

 may be included. 



Lock-gates. The lock-gates shall be in number and dimensions as shown on the 



drawings, of timber of the same quality as that specified in paragraph 46. All the 



timbers must be dressed on all sides and out of wind, and of the full size marked on 

 the drawings after being framed. They shall receive one coat of pure linseed oil on 

 all sides and ends as soon as dressed. 



The pieces must be accurately framed and assembled in the yard first, where all 

 ironwork must be carefully fitted on. The toes of the gates shall be left rough, and be 

 sawed and dressed down to exact length after the gates have been finally assembled 

 in place. This final assembling must secure a close fit at all points of quoins, toes, and 

 sills, and proper freedom of movement. 



After they have been hung and put in proper working order the gates shall receive 

 two coats of the best red lead and oil on the timbers, and two coats of asphaltum var- 

 nish on the ironwork. 



The cost of all material and labor on the gates, including the painting, shall be 

 covered by the contractor's prices for "Iron and Steel" and for "Timber in Permanent 

 Construction." 



51. Measurement. The timber for the sills and lock-gates will be measured as 

 the net cross-section of the finished stick multiplied by its extreme length in place; 

 the timber for the cribs and sheet-piling will be measured in place, no deduction being 

 made for the ladder recesses or for the parts necessarily cut out in making lap-joints. 

 Drift -bolts, raft-fastenings, nails and spikes, which form part of the permanent work, 

 will, unless otherwise noted, be paid for at the contractor's price for " Iron and Steel." 

 Riprap filling will be measured by taking the inside dimensions of each pen comprising 

 the crib. 



Payment for the timber in the gates will not be made until the gates have been 



