972 Transactions of the American Institute^ 



current, so as to facilitate building the opposite crib work, there need 

 be no great waste of material in its construction, nor will it require 

 much surface width, and for this use layer stone can be selected ; the 

 crib work on the opposite side can be anchored- and built with or 

 without this device successfully. 



The tunnel work between the rip rap walls will have so heavy a 

 side protection, about 200 feet thick on each side at the base, as to 

 be easily made " thorough cut " showing, without a resort to coft'er 

 dams or pumping. 



On this basis of plans the quantities and items of cost are thus 



estimated : 



281,000 yards . . Rip rap wall, at $1.25 $351 , 250 



930,000 yards. . Earthhll, 60c $558,000 



35,000 yards . . EarthfiU, 30c 10 , 500 



568,000 



Guard locks : 



2,125 Foundation piles, $17 $36 , 125 



Foundation dredging 675 



2,200 m. feet . Caisson framing, 60c 132 , 000 



Caisson bridging, anchors, &c. 10,000 



25,575 yards. . Paibble masonry, $16 409,200 



3,200 yards. . Cut stone, $45 144,000 



6,800 yards. . Brick work, $18 122,400 



5 Caisson gates, $50,000 250,000 



1,104,400 



Sea wall : 



3,750 feet . . . Crib work, %m $247, 500 



6,375 yards . . Rubble masonry, $15 95 , 625 



1,390 yards. , Cut stone masonry, $45 62)550 



Fenders, rings, &c 1 ,000 



Tunnels: 406,675 



38,500 yards.. Brick work, $16 $616,000 



4,500 yards . . Concrete, $8 36 , 000 



Sky lights, &c 2,000 



* Stairways 1,000 



2,450 feet . . . Iron railing, $5 11 , 250 



36,450 sq. yds . Paving, $2.50 91 , 125 



51,800 sq. feet . Flagging, 50c 25 , 900 



7,760 feet . . . Curbing, $1 7,760 



791,935 



225 Swing bridges 18,000 



Engine, cfec 50,000 



70 Warcliouses, $25,000 1 , 750 , 000 



Contingencies 700 , 640 



Land damages, law, &c 260 , 000 



^,000,000 



