CHAPTER XVII. 
BILLS OP MATERIALS, AND ESTIMATE OF COST. 
hi ^^kiiig out bills of materials, tlio list of members given iu Chapter III. will 
J: °. ve of great assistance. By its use, one can avoid an umlerestimate due to an 
fission of any of the parts of the structure. A <?ood way to make out a bill of 
aterial is to prepare six vertical columns, in the first of which write the name of 
e member ； in the second, the number of pieces ; in the third and fourth , the 
心二 ⑽， determining theii. section ; in the fifth, their lengtlj ; and in the sixth, the 
だ 10 f a U tlie pieces, or, if of wood, the number of feet, board measure, that they 
The following example will serve to explain t-lio method : 一 
BILL OF WROÜGHT-IKON. 
ghord channels 
Batter-brace channels 

Post channels ... 
. Lateral struts … 
Lateral struts •• • 
Jlain diagonals... 
Counters 

12 
r 
i ず t 
22 f 
2, 77 パ 
8 
8 r/ 
33 V 
3,375“ 
I 
r 
i パ 
202 f 
2,620 te 
8 
5" 
6rc 
22 r 
1,14 4“ 
4 
4 
4" 
6 C [ 
IS ， 
}6o tf 
5" 
6^c 
げ 
39。“ 
8 
r 
ir 
34 ， 
I,020 f, 
8 
r 
r 
35 r 
52S“ 
is to he noticed that it is often conveneint as in tlie case of the “Plate ” to 
combine several lengths into one. 
threo ^ f 0 length of each chord bar, main diagonal, and liip vertical i a to be added 
about ミ # a 】 l° w the weight of the heads ； and to that of eacli adjustable rod 
ひ i,eatf> 'で iee t ， f or the heads, upset ouds, and sleeve nufs or turn buckles. Should 
t 0 a ? iC . cura *cy bo required for the weight of an adjustable rod, it will be necessary 
the mf ltaiU lougtli will be needed at each end for the Iieads, and how much for 
P ⑽ t ends and titljusting-nuts by the following 
table of equivalent lengths of rods for upset ends, 
nuts, sleeve nuts, and turn buckles. 
r —l" 
1 upsot end and x nut 
feet of rod 
は " 一 - if 
i upset end and i nnt 
i upset end and i nut 
ig feet of rod 
1 4 } feet of rod 
中 一 
i upset end and i nut 
、毛 feet of red 
2 upset ends and i sleeve nut 
2| feet of rod 
X A' 一 2 {” 
- upset ends and i turn buckle 
3 feet of rod 
