— 153 — 
ousaud, falsework two yen per lineal foot of bridge, hauling one yen per tou, 
flection and painting as per tables, blacksmitliing and coal fifteen sen per lineal 
1 s pau, travelling expenses thirty sen per lineal foot, engineering expenses 
】 011 e to two yen per lineal foot, teaming during construction fifteen sen per 
a too t， common labonrer's wages twenty five sen per day, and incidentals ten 
Per cent. 
If there be two spans in the bridge, tho estimated cost of the two may be 
uced by five per cent., if there be three, the total cost may be reduced by six per 
Ce ut, And, if there be more than tliree, by seven per cent. 
Span. 
Yen. 
Span. 
Yen. 
Span. 
Yen. 
6 。， 
3,500 
】 5 び 
12,710 
240 ， 
3 l,CCO 
70 f 
4，170 
16 c/ 
14,540 
25 。， 
3 5,450 
8 。， 
4,950 
1 7 び 
1 6,^90 
i 6 o r 
36,150 
S 。， 
5,6 
i8o r 
17^5° 
27c/ 
39>45 〇 
iocy 
6,650 
19 〇 # 
19,850 
280^ 
4 ろ 5co 
110 ， 
7,440 
2CO f 
21 ,800 
290' 
•46 パ co 
120 ， 
8,580 
2lC f 
24,130 
w 
49,5 こ。 
IJC ， 
10,110 
■ 220 * 
26,100 
1 4 ヴ 
l し 300 
23O, 
28,060 
One paper yen lias been taken equal to ninety-five cents In Mexican oi. Japanese 
u v , and 01le dollar or yen of the latter equal to ninety cents gold. The prices 
alw ( 。ど ^ 0n aro American. The prices in the tabic are in paper yen : they 0110 uld 
Va ys be changed to suit tlie varying values of paper and silver money in compari- 
8011 witl1 goW as a standard. 
c y\ 03118 い 10 1 be forgotten that the estimated costs in the table are for aceraye 
1 ^° ns, sucli as fairly good roads and weather, absence of freshets, a single tier 
^ raiIle ^ falsework on piles not exceeding twenty feet in length, a favourable looa- 
lal) U ^ 仙 6 す 01 s ^ 01 ^ n S materials, erecting tents &c., no probability of a scarcity ot 
foi. 0l ^ leiS 01 【heir heiug attacked by disease, workmen to provide food and shelter 
timb lerüse ^ ves > 110 special tools required, and no extraordinary loss of tools oi. 
Before niakiug an estimate on a bridge, one should endeavour to obtain as 
aüy as possible of the following. 
Da TA FOR DESIGNING IRON RAILROAD-BRIDGE SUPERSTRUCTURES, 
AND ESTIMATING THEIR COST. 
Length of span or spans. 
distance of bridge site from nearest railway -station or seaport. 
Quality and condition of the roads between these places, 
ature of bed of river, and velocity of stream, 
eight of lower chord above bed of river. 
l0ss 8ec tiou of stream at crossing, showing borings, if any liavo been made, 
which the direction of bridge makes with axes of piers or abutments. 
